Hi, the causing plugin was “WP Add Custom CSS”
Thank you for this quick response..
You where right – there was actually another CSS plugin activated!
After deactivating this one i’m again able to work – great!
But i’m realy wondering why this issue don’t appear right before?
Cause i’m quite sure that the now deactivated plugin was activated many weeks ago.
THX for your support…
Jörg
