A colleague of mine today had frozen palettes in their Revit LT. The properties and project browser were not clickable at all.
- 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!