This is the same problem (or at least the same symptoms) as 46989, but that was marked complete. I've been getting this pretty regularly, maybe 6 times in the last week:
It happens on both close and reopen votes. I looked the most recent time for the error information Jeff mentioned, but couldn't find it. Is this a known/common problem, or is it just me?
I should probably mention since it was provided in the other post: I'm using Firefox 3.6.3 on Linux