problems displaying bones

I don’t know what I’ve exactly done, but after editing my amature in pose mode the bones suddenly disappeared. after osme undoing, blender restarting and playing around with some settings (wireframe view, x-ray bones) my bones didn’t appear again. But i can pose them as they were displayed. in edit mode everything works fine. i’ll post a screenshot.

My system:
AMD Athlon™ 64 X2 Dual Core Processor 4200+
ATI Radeon x600
Linux 2.6.20.2 (64bit)
Blender v2.44

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ugh, sorry, I think I hit H-key, that hides all selected (so all) bones. Alt+H (Pose>Show/Hide Bones>Show hidden) solved the problem. I just didn’t know that feature…