I set up a site, added in my theme and then noticed I could upgrade to version 3.5 - so I did that. The Settings->Permalinks page is totally blank. I have deactivated plugins, changed theme back to Twenty Eleven & Twenty Twelve. Tried various "fixes" I found searching the forum which caused the whole thing to crash and I had to re-upload all the files via FTP.
My server is using PHP v 5.3.2 and I've asked the hosting company to check that all permissions are set correctly. They assure me it is not their end but a peculiar setting in WP. I don't know if this problem was there prior to the upgrade to latest version.
Can you help me fix this?