If you are working with a BCF Manager in Archicad on MacOS, it's possible that you see a snapshot of your desktop in the issue viewpoint.
This happens when the framed function in the Edit comment dialog takes a snapshot of the desktop instead of the application.
After a MacOS security update, you need to give the application approval to allow screen capture by ArchiCAD.
You will get a popup for this, but in this popup can pop-up behind either Archicad or the BCF Manager window itself.
Go to the system settings on your Mac > Privacy&Security > Screen Recording (& System Audio)
Allow Archicad 27 to take a Screen Recording.