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I have this problem as well. Every so often it has trouble remembering.
I've read that certain versions of vbulletin have problems with content caching.
It has to do with its datastore. Personally, I just reread the few threads this happens to me. (It happens nearly every day, and not browser based. so im certain its a content caching issue).
A quick google search revealed that a possible fix (but it would slow down the performance of the forums)
AdminCP > Settings > Options > Server Settings and Optimization Options > Disable Content Caching
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