worked on my language and now with 6.5.1.1
I can post with html codes in my posts.

and no, I don't mean only br's but things like char codes.
tabs and carriage returns in the &#-notation.

but like said, now it thankfully seems to work.
(just updated yesterday, so maybe haven't yet just found anything on that)

so, thanks to the tweakers who didn't just give up.