Xbuntu / AMD
Short description of error
If you have multiple bones in pose mode and want to do a border selection it will not give you a visual indication what has been selected until you start moving it.
Exact steps for others to reproduce the error
Make an armature with a bunch of bones
In pose mode, do a border select (B) for some of them
...it looks like nothing is selected...
Try moving them (G)
...all of a sudden they are selected...