A colleague of mine today had frozen palettes in their Revit LT. The properties and project browser were not clickable at all.
The solution is not as we discovered to reinstall but to reset Revit LT settings by renaming the registry folder group for revit as per the following video.
- Close Revit LT
- Lauch regedit
- Go to current User –> Software –> Autodesk –> Revit
- Find whichever Revit you use , for example Autodesk Revit Revit LT 2018
- Change the name Autodesk Revit Revit LT 2018_backup
- Launch Revit LT again and the palettes should now work!