Upgraded from 4.0 to 4.1 all seemed to work fine. Including my old theme. Then, as admin, it seems that simply visiting the Themes link when Administering the Site has broken something. Now, no matter what themes I enable and no matter what theme I set as the site default, they are never used. Some sort of plain jane text only look is used. I've looked in the system table and things seem fine. I've looked in the variables table and things seem fine.

Please help! Are there gotachs to do with themes when upgrading to 4.1?

M