[TYPO3-english] RTE won't save colours?

[Scotty C]

Hi again everyone,

You have been so helpful to me today and at the risk of "pushing my luck", I 
have another problem/question.

I am running a few installations of TYPO3 4.4.x (where x = 5 or 6) - all with 
identical configurations AFAIK - and in one install, the RTE won't save colours. 
By this, I mean that if I enter text, highlight it, change its colour with the 
RTE, click "save", then return to the element, the coloured text is back to 
black... as if I never changed its colour at all!

Has anybody seen this before and/or know how to resolve it? Thanks again in 
advance,
-Scott.