[TYPO3] New classes not available in RTE selection list

[Denis Bilodeau]

I know of the RTE list, but traffic is rather rare there at the moment, 
and I expect many here will have encountered the same problem.

In RTEhtmlarea, I have a list of my classes in the selector list, from 
my CSS stylesheet. I add a class on the stylesheet, and it does not show 
  up in the selector list.

I have read the postings, manually cleared the browser cache, checked on 
  a different computer whether it is the browser cache, and the list is 
not updated there either.

I have renamed the CSS sheet and template where the CSS stylesheet is 
named, in order to force a reset. No result.

I have allowed the new class in "proc.allowedclasses" etc. It is 
allowed, and I change to the new class manually and when I save, the 
class is recognized, saved, and effective in the text editor but in the 
selector list, the class is identified as "undefined".

What am I forgetting? Anyone can help? If it is a cache, please detail 
how to update it, I have tried everything I know.

Many thanks,
Denis