Comment 3 for bug 170972

The most annoying thing here is you may have a "fake group" (a single object or a single path grouped with itself = select object then Ctrl+G). In this case, you can try to apply any boolean operation without success and you have no idea why is not working until you read the status bar to see there is a "group" of a single object involved. I think at least should be displayed a warning. Other solution is to prevent the possibility to create groups with less than 2 objects.

Because of the "fake group" situation, I suggest to change the Importance of this issue from Wishlist to Medium.