Thanks! Deleting and uploading the theme worked as well and was a bit less complicated than doing that with the plugin. Now I only have to find out how to make the changes in the theme I wanted to make, but I’ll ask that where I found the plugin.
Thanx both of you. I already back-up-ed and upgraded WordPress succesfully, so obviausly I didn’t have any ht-access files:-) In fact I think it is logic, because I just realized my host uses windows servers instead of Apache.
