Chatty, I've had the same problem whenever I try to change my quotation at the end of my signature. I think I may have figured out that although the limit says 255 characters, it's actually something like 244. I typed mine all out in Word first, and used the Word Count tool to check how many characters I was using - and it wasn't until I got the whole signature down to 244 that the BWS system finally accepted it.
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When you don't like a thing, change it.
If you can't change it, change the way you think about it.

(Maya Angelou)