I know there was an issue a while back in 10.2 where groups in BBM would hang and lag really bad. I'm experiencing that again in 10.3.1.2267 -- personal messages are fine, but in the three groups I belong to, there is a massive lag whenever messages are exchanged. If I send a message it will cause the number of members to display 0 and the group name to disappear, and it usually doesn't clear up for about 5 minutes.
I'm using the latest version of BBM and am part of the BBM beta program. Anyone else have similar issues or know what might be the problem?
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EDIT: Started doing it with non-group contacts too...
I have had some issues with BBM lagging on different platforms across my devices this weekend. Give it a bit of time, it may be they are doing work on the back end. Other than that, a reboot might be in order.