When you turn on Sun shadow for the 3D view, 3D may stop working on some Intel graphics cards with some driver versions.

Workaround:

• Remove all textures from the project
• Do no reload/refresh 3D, close and open it instead each time.
• Try the latest driver version or hope Intel will fix it next time

If you have Dell computer and you install 64-bit version of Room Arranger, it might crash when showing Project - Open and Project - Save As… dialog window. It is probably caused by Dell Recovery & Backup shell extension, as described here: QTBUG-41416.

Workaround:

• Use 32-bit version of Room Arranger
• or remove Dell Backup shell extension