>When I try to save changes to my UT account, I get message about tags in the signature. I didn't change anything in my signature. Why can't I save it anymore?

Tight security in place :)

BTW, I got the same error

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Windows Internet Explorer
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Only the <B>, <CENTER>, <I>, <P> and <BR> tags are allowed in Signature field.
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OK   
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I guess font tags are not allowed anymore.