BlackBerry Beta Zone members have a new version of BlackBerry Messenger available today. If you are currently testing BBM Music, you are instructed to stay on BBM v126.96.36.199, but if you aren't involved in that program, you may feel free to install v188.8.131.52 and give it a whirl. This upgrade is said to have focused on fixing file and picture transfer bugs, as well as the addition of subscription payment support for platform-enabled apps. Be sure to do a back-up before installing, and leave feedback in the Beta Zone discussion forums.
If you're not already a member of BlackBerry Beta Zone and would like to sign up, head on over to blackberry.com/beta and get registered.