I am loading in avalon Txt viewer in the dock, I have tried with regular txt box and a rich text box, same results. If i open a file larger than 50kb and apply the txt to the box it will lock up the application in the DevZest Docks no matter what type of dock. Now if i create a test app that i put the user control in the main window and launch there is no problem it runs at maybe 100MB. So the issue lays in the Docking since the issue only arises when place in the docks.