[TYPO3-rte] htmlarea additional class doesnt work

[Dominic Garms]

Hello,

I tried so many things but couldnt find the problem yet. I simply added 
some classes to the RTE but the "Block style" or "Text style" inside the 
RTE stays inactive (TYPO3 4.5.2).

Here is my TSConfig:
RTE.default.classesCharacter = red-error
RTE.default.classesParagraph = feature-text, big-text, red-error

RTE.default.proc.allowedClasses = 
first-header,feature-text,big-text,red-error,align-center,align-left,align-right

RTE.classes {
     first-header {
         name = First Header
     }
     feature-text {
         name = Feature Text
     }
     big-text {
         name = Big Text
     }
     red-error {
         name = Red Highlight
     }
}

RTE.default.contentCSS = fileadmin/templates/skins/css/rte.css

In a different installation with the same setup everything works as 
expected.

Does anybody can give me a hint where else I could search?

Best Regards,

Dominic