So I wanted to change to another theme and that did not go so well.:) I changed from Graphpaperpress Fullscreen to their Sideswipe. I wanted to change a few things in the preview. I pressed Save and Activate and godt a 500 error. To get back to my previous theme Fullscreen, I changed the name of the .htaccess file. Now ony the frontpage is working. Most of the admin panel works. I just want to get the old theme working again. :) Is it htaccess related?