I've encountered this myself several times and can confirm it.

It should be added to the "groups are broken" section with a touched up version of alios excellent description.



Oh, and Alio-- I think clicking both mouse buttons is more than you need to cancel an order. Just click the left mouse button to cancel.

Also, if I remember correctly, there is a bit more to this bug but I can't remember the details and what we have is good enough to get them working on it.

Good work Alio.