I have a widely-used module that appears to be bug free, except for one user, who is using a Mac.
He sent me a screencapture of a reproducible problem.
When he tries dragging a piece from a deck, the image of the piece moves with the cursor for some distance, then a rectangular group select box appears from the piece source to the cursor. When he releases the mouse button, the piece is placed, and the piece, the deck it came from, and everything else in the group select is selected.
If he fails to notice this, and tries to drag a second piece from somewhere, everything that was group selected gets moved, which can be disastrous if the first deck was a deck of face-down cards that get drawn face-up.
Apparently he does *not* have this problem in other modules, he can reproduce it on both his Mac devices, but it's not a problem anyone else has been able to reproduce.
Can anyone tell me what is going on?