[TYPO3] RTE underline doesn't stick

[Christoph Koehler]

Hello,

I have a problem with underlining in the RTE; it just won't stick. Bold  
and Italics and all work fine, but underline doesn't.
I updated to the newest version to see if that was it, but no change so  
far. Cleared typo3conf and FE cache as well as browser cache. Am I missing  
something? Anyone else seen that problem before?

Christoph