[_ck_]

You need to make sure the .htaccess is in /Forums/ and not the root of the entire site. Your host’s directory structure is a little strange but I don’t think it will interfere with mod_rewrite.

There is a possibility that there is a rule in the root .htaccess that is interfering the lower .htaccess. But let’s first make sure it’s in the correct directory.

By the way:

/Forum/topic/forum-guidelines-please-read

is correct.

/Forum/forum-guidelines-please-read/

is wrong.

bbPress needs to know that the string following is a topic, otherwise it doesn’t know what to do with it (it might be a forum). /Forum/forum/forum-name is also legit.