I started all over again (see previous post) and the site is running again. I didn't know what the bugs were so I cannot tell if it is better than the last version.

What I did found is that it is not possible to delete a membership level. The option is there (membership levels, scroll down "levels" -> "non-member" "standard" "promotion") . Also there is a button "select all" it doesn't work.
I don't want non-members or guests to do anything see more on my site. It is possible to work around it, just deactivate all actions for a non-membership and then at the buildermenu deselect all "guest" buttons. its a hell of a job, but allright, I've got it fixed allready. Just thought I should make a notition here for the fact that this doesn't work...