I had 2 bbm group messages that would never delete....
No matter what I did rebooting, hub restart, golding the message and deleting, deleting from the date etc....nothing worked, those 2 pesky messages always stayed there...until I did the following:
Highlight each message until the sidebar pops up. Instead of pressing that instinctive garbage can...press the "select" button.
Now press the garbage can...voila that pesky message was finally deleted!!
Pain in the **** to have to highlight and select a single. Message but it worked flawlessly.