Tree View disappears, really disappears

Hi,
V. 10.0.4.0

Today the tree view suddenly disappeared while using RDM. Thought this might be that cache problem which usually goes away if I click "Test Server, Test Database" in the Data Sources Setup window but that didn't work. All other views are functioning normally however. This happens with the SQL data source as well as a local xml file, newly created or existing Data Source.

Things I have tried/notable mentions..

1. Rebooting
2. Creating a new identical source, XML and SQL
3. Repairing the RDM install
4. Typing a server name in the search box will bring up the server in the dashboard, but the tree view is still blank
5. Other members of my team do not have a problem with the tree view at all

Things I want to try...

1. Delete *.lyt files
2. Delete GUID folders in AppData
3. Reset UI , don't know where that option is
4. Full uninstall/reinstall

help?