I've been using WordPress 2.5 on my website for awhile now without any problems.
Recently, I encountered a strange problem - Visual Mode was no longer working. That is, it says it's in Visual Mode but is actually in HTML mode, and I can't switch between modes.
I haven't changed any settings on my host's control panel - this problem just popped up out of the blue.
I've tried using different browsers, but it hasn't made any difference.
You can see the blog here.