diff --git a/dev/ucsc/hub.html b/dev/ucsc/hub.html
index 916576826..be497899c 100644
--- a/dev/ucsc/hub.html
+++ b/dev/ucsc/hub.html
@@ -7,10 +7,12 @@
 <body>
 
 <select id="select">
-    <option value = ""></option>
-    <option value="https://hgdownload.soe.ucsc.edu/hubs/GCF/000/186/305/GCF_000186305.1/hub.txt">Many chromosomes ~ same size
+    <option value=""></option>
+    <option value="https://hgdownload.soe.ucsc.edu/hubs/GCF/000/186/305/GCF_000186305.1/hub.txt">Many chromosomes ~ same
+        size
     </option>
-    <option value="https://hgdownload.soe.ucsc.edu/hubs/GCA/022/747/635/GCA_022747635.1/hub.txt">Many chromosomes - gradually decreasing
+    <option value="https://hgdownload.soe.ucsc.edu/hubs/GCA/022/747/635/GCA_022747635.1/hub.txt">Many chromosomes -
+        gradually decreasing
         chromosomes
     </option>
     <option value="https://hgdownload.soe.ucsc.edu/hubs/GCF/013/103/735/GCF_013103735.1/hub.txt">24 large chromosomes
@@ -26,6 +28,9 @@
 <button id="load-genome">Load hub as genome</button>
 <button id="load-session">Load hub as session</button>
 
+<br>
+<button id="dump-session">Dump session</button>
+
 <div id="igvDiv" style="padding-top: 50px;padding-bottom: 20px; height: auto"></div>
 
 <script type="module">
@@ -46,8 +51,8 @@
 
     const browser = await igv.createBrowser(document.getElementById('igvDiv'), igvConfig)
 
-    browser.on('genomechange', (genome) => {
-        console.log(genome.trackConfigurations)
+    browser.on('genomechange', (args) => {
+        console.log(args)
     })
 
     const selector = document.getElementById("select")
@@ -59,10 +64,12 @@
         await browser.loadGenome({url: document.getElementById("hub-input").value})
     })
 
-
     document.getElementById("load-session").addEventListener("click", () =>
         browser.loadSession({url: document.getElementById("hub-input").value}))
 
+    document.getElementById("dump-session").addEventListener("click", () => {
+        console.log(browser.toJSON())
+    })
 
 </script>
 
diff --git a/js/bigwig/trix.js b/js/bigwig/trix.js
index 1ad726211..533e0016a 100644
--- a/js/bigwig/trix.js
+++ b/js/bigwig/trix.js
@@ -37,7 +37,7 @@ export default class Trix {
         const searchWord = searchWords[0].toLowerCase()
         const str = await this._getBuffer(searchWord, opts)
         if (!str) {
-            return []
+            return undefined
         }
 
         const lines = str
@@ -54,7 +54,7 @@ export default class Trix {
             }
             // we are done scanning if we are lexicographically greater than the search string
             if (word.slice(0, searchWord.length) > searchWord) {
-                //break
+                break
             }
         }
 
@@ -66,7 +66,6 @@ export default class Trix {
                 const [term, ...parts] = m.split(' ')
                 results.set(term, parts.map(p => p.split(',')[0]))
             }
-            console.log(results)
             return results
         }
     }
@@ -117,7 +116,7 @@ export default class Trix {
         if(this.bufferCache.has(start)) {
             return this.bufferCache.get(start)
         } else {
-            const buffer = igvxhr.loadString(this.ixFile, {range: {start, size: len}})
+            const buffer = await igvxhr.loadString(this.ixFile, {range: {start, size: len}})
             this.bufferCache.set(start, buffer)
             return buffer
         }
diff --git a/js/browser.js b/js/browser.js
index b570fba6f..d177fc197 100755
--- a/js/browser.js
+++ b/js/browser.js
@@ -707,16 +707,22 @@ class Browser {
             throw new Error(`Cannot set initial locus ${locus}`)
         }
 
-        if(genomeChange) {
-            this.fireEvent('genomechange', [genome])
-        }
-
-        if (genomeChange && this.circularView) {
-            this.circularView.setAssembly({
-                name: this.genome.id,
-                id: this.genome.id,
-                chromosomes: makeCircViewChromosomes(this.genome)
-            })
+        if (genomeChange) {
+            let trackConfigurations
+            if (genomeConfig.hubURL) {
+                // TODO -- refactor this so "hub" is not loaded twice
+                const hub = await Hub.loadHub(genomeConfig.hubURL)
+                trackConfigurations = hub.getGroupedTrackConfigurations()
+            }
+            this.fireEvent('genomechange', [{genome, trackConfigurations}])
+
+            if (this.circularView) {
+                this.circularView.setAssembly({
+                    name: this.genome.id,
+                    id: this.genome.id,
+                    chromosomes: makeCircViewChromosomes(this.genome)
+                })
+            }
         }
     }
 
@@ -1317,7 +1323,7 @@ class Browser {
     getTrackURLs() {
         return new Set(this.tracks
             .filter(track => track.config && StringUtils.isString(track.config.url))
-                .map(track => track.config.url))
+            .map(track => track.config.url))
     }
 
 
diff --git a/js/genome/genome.js b/js/genome/genome.js
index 7f05c05ce..7002766d0 100644
--- a/js/genome/genome.js
+++ b/js/genome/genome.js
@@ -84,7 +84,6 @@ class Genome {
         }
     }
 
-
     get description() {
         return this.config.description || `${this.id}\n${this.name}`
     }
@@ -279,9 +278,6 @@ class Genome {
         this.chromosomes.set("all", new Chromosome("all", 0, l))
     }
 
-    get trackConfigurations() {
-        return this.config.trackConfigurations
-    }
 }
 
 /**
diff --git a/js/genome/twobit.js b/js/genome/twobit.js
index 516265a26..867cc34e1 100644
--- a/js/genome/twobit.js
+++ b/js/genome/twobit.js
@@ -24,7 +24,6 @@ class TwobitSequence {
 
     littleEndian
     metaIndex = new Map()
-    bpt
 
     constructor(config) {
         this.url = config.twoBitURL || config.fastaURL
diff --git a/js/ucsc/ucscHub.js b/js/ucsc/ucscHub.js
index 41aa612ad..b66808802 100644
--- a/js/ucsc/ucscHub.js
+++ b/js/ucsc/ucscHub.js
@@ -27,22 +27,25 @@ class Hub {
             }
         }
 
+        // TODO -- categorize extra "user" supplied and other tracks in some distinctive way before including them
         // load includes.  Nested includes are not supported
-        for (let s of stanzas.slice()) {
-            if ("include" === s.type) {
-                const includeStanzas = await loadStanzas(baseURL + s.getProperty("include"))
-                for (s of includeStanzas) {
-                    s.setProperty("visibility", "hide")
-                    stanzas.push(s)
-                }
-            }
-        }
+        // for (let s of stanzas.slice()) {
+        //     if ("include" === s.type) {
+        //         const includeStanzas = await loadStanzas(baseURL + s.getProperty("include"))
+        //         for (s of includeStanzas) {
+        //             s.setProperty("visibility", "hide")
+        //             stanzas.push(s)
+        //         }
+        //     }
+        // }
 
         return new Hub(url, stanzas, groups)
     }
 
     constructor(url, stanzas, groupStanzas) {
 
+        this.url = url;
+
         const idx = url.lastIndexOf("/")
         this.baseURL = url.substring(0, idx + 1)
 
@@ -110,11 +113,12 @@ isPcr dynablat-01.soe.ucsc.edu 4040 dynamic GCF/000/186/305/GCF_000186305.1
     getGenomeConfig(includeTrackGroups = "all") {
         // TODO -- add blat?  htmlPath?
         const config = {
+            hubURL: this.url,
             id: this.genomeStanza.getProperty("genome"),
             name: this.genomeStanza.getProperty("scientificName") || this.genomeStanza.getProperty("organism") || this.genomeStanza.getProperty("description"),
             twoBitURL: this.baseURL + this.genomeStanza.getProperty("twoBitPath"),
             nameSet: "ucsc",
-            wholeGenomeView: false
+            wholeGenomeView: false,
         }
 
         if (this.genomeStanza.hasProperty("defaultPos")) {
@@ -178,12 +182,10 @@ isPcr dynablat-01.soe.ucsc.edu 4040 dynamic GCF/000/186/305/GCF_000186305.1
             config.tracks = this.#getTracksConfigs(filter)
         }
 
-        config.trackConfigurations = this.#getGroupedTrackConfigurations()
-
         return config
     }
 
-    #getGroupedTrackConfigurations() {
+    getGroupedTrackConfigurations() {
 
         // Organize track configs by group
         const trackConfigMap = new Map()
@@ -259,7 +261,7 @@ isPcr dynablat-01.soe.ucsc.edu 4040 dynamic GCF/000/186/305/GCF_000186305.1
             if (config.description) config.description += "<br/>"
             config.description =
                 `<a target="_blank" href="${this.baseURL + t.getProperty("html")}">${t.getProperty("longLabel")}</a>`
-        } else if (t.hasOwnProperty("longLabel")) {
+        } else if (t.hasProperty("longLabel")) {
             config.description = t.getProperty("longLabel")
         }
 
diff --git a/test/testTwobit.js b/test/testTwobit.js
index 8d4848856..2348b0e60 100644
--- a/test/testTwobit.js
+++ b/test/testTwobit.js
@@ -88,6 +88,10 @@ suite("testTwobit", function () {
         const bpTree = await BPTree.loadBpTree(url, 0)
         assert.ok(bpTree)
 
+        assert.equal(256, bpTree.header.blockSize);
+        assert.equal(15, bpTree.header.keySize);
+        assert.equal(8, bpTree.header.valSize);
+
         const result = await bpTree.search("RJWJ011179649.1")
         assert.ok(result)
 
diff --git a/test/testUCSC.js b/test/testUCSC.js
index cc52c7902..cc27a396d 100644
--- a/test/testUCSC.js
+++ b/test/testUCSC.js
@@ -11,7 +11,7 @@ suite("ucsc utilities", function () {
         this.timeout(200000)
         const ixFile = "test/data/bb/ixIxx/GCF_000009045.1_ASM904v1.ncbiGene.ix"
         const ixxFile = "test/data/bb/ixIxx/GCF_000009045.1_ASM904v1.ncbiGene.ixx"
-        const trix = new Trix(ixxFile, ixFile, 10)
+        const trix = new Trix(ixxFile, ixFile)
         const results = await trix.search("ykoX")
         assert.ok(results)
         const exactMatches = results.get('ykox')
