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If you're using perspectives, it's likely that switching to one of the perspectives is resetting the sidebar width.

I have this problem as well, I believe it's the restore->layout checkbox that controls this. Problem is, layout in perspectives also controls OTHER things that I want to be restored, so it's really annoying.

I wish there were a way to have a LEAVE MY SIDEBAR WIDTH ALONE setting in the perspectives, but I don't think there is. If there's a trivial way to do this without affecting other layout options I'd be stoked to hear it.