Hi,
I have a file that has an issue, that I cannot reproduce by itself, so it's somthing in the comaibnation of layers probably.
In that file:
1. Create a new later above an active one
2. Select both, and group them.
3. AP gets constant lag (~1-2s) and r-click opens the context menu in the upper left corner of of the window.
I can send you the file for private investigation.