While playing in Adventure mode while on my multi-player server, I died while fighting a skeleton. When I went back to collect my things, I was unable to punch the skeleton for any damage, nor were any hits registering on the skeleton (it did not flash red or recoil from the hit).
After several minutes, I came back to that area and was able to punch, so it may have been a temporary problem. The skeleton was able to shoot me, and killed me very quickly.
I have a video where this is visible, as I was recording a Let's Play when it happened. It is at http://www.youtube.com/watch?v=EuSBNQ4cukg time is 11:28 (before death) to 14:14, where I was able to damage the skeleton (not sure if it was the same one, though).
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No plugins, it was a vanilla server on the 13w17a snapshot. I will test it tonight, again, to attempt to reproduce. I have view distance set to 11, port is different than normal, game mode 2, difficulty 3, and the server is whitelisted, otherwise I didn't change the default settings.
Where I was killed was in very close proximity to the spawn point (within 20 blocks or so), so I am wondering if that might have something to do with it. When we died farther from spawn (in later videos), this seemed to not be an issue.

Duplicate of MC-2713.
Cannot reproduce.
Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here - one after dying , second in "normal" state.
What plugins has the server running ?