Pose mode not accessible from 3Dview for proxy linked armature

When I link a Group of objects into my scene with an armature included in the group and then, with the group selected, make a proxy version of the armature I’m unable to access Pose mode from the 3D View… In the Outliner I can get to Pose mode by selecting it there, and when I do the 3D view mode shows the Pose-mode icon but no text, and the drop down menu and the Tab button only let me select Object mode.

Is this a bug or am I doing something wrong? If it’s a bug it seems like an obvious one so I figured I’d ask here first. I’m using 2.59

Edit: This is a bug in 2.59. Current trunk for 2.60 fixes this issue as of revision 40372