Vue 2 source code not appearing in Chrome

[paulsimongb]

I have an old Vue 2 App that I need to get working. However, in Chrome I am no longer seeing the source code.

Instead there are 4 files per component
The final one has /* hot reload */ comment
None show the source code.
I have tried all the suggestions online such as setting Allow access to URLs and various changes to vue.config.js or adding
Vue.config.debug = true;
Vue.config.devtools = true;

however, none of these have worked.

I cannot tell if this is something related to the WebPack that VueCli is generating or something Chrome.

Does anyone have any ideas?

Regards

Paul