These are the steps I took that led to the error:
1. Mounted account as a disk in Transmit.
2. Dragged assets folder to Textmate to edit templates.
3. Logged into CP and then deleted /admin/ template group.
4. Renamed /site_admin/ to /admin/.
5. Renamed /admin/ in the templates folder on the server to /old_admin/ and then /site_admin/ to /admin/ (and then eventually deleted /old_admin/).
6. Tried to access the control panel and got the 500 error. Same thing happened for the EE front end.
Everything else on the site which isn’t related to EE works OK. First thing I thought of was the .htaccess but deleting it didn’t fix it.
Checked the error logs, the one in root doesn’t have any recent enries, the one in the system folder has Unable to parse XML data but the error was reported from before I made the changes and there’s also an entry for the same error from the previous day so I don’t think it’s that.
Not sure what else to look at. :grrr: