I did an upgrade from 1.5.2 last night to 1.7.3. After some teething problems (http://ellislab.com/forums/viewthread/233133), I’ve got the site up and running again and the client has been able to add entries.
However, there seems to be some kind of problem related to PATH_INFO so the URLs don’t work. I had the setting ‘Force URL query strings’ set to ‘No’. So one quick fix for the PATH_INFO problem would seem to be to set this to ‘Yes’.
Trouble is, I can’t make the control panel change the setting, it always reverts straight back - and it does with ANY setting change.
I’m logged in as a super admin.
Any ideas?