I have a pretty weird error in a Magento setup:
The page loads normally and shows in the browser. However, when I inspect it using firebug, the server returns the page as a server error 500!
This leads to problems for Google which states that it cannot access the pages.
Again, the pages do show, you can browse the shop normally.
Some pages load without this 500 error (e.g. homepage), but many pages have this effect.
I already checked the file permissions, the memory limit (set this high to 1024M to be sure) and the .htaccess file and both seem to be fine. Any ideas of what could produce this?
The server error log does not shield any insights.