I recently moved all my clients over to an install of WordPress Multi-Sites to enable them to have a single sign on for all their websites. I didn’t however factor in any problems that I’d face with doing this. It all went pretty smoothly to be honest with one or two problems that I’ll document on here. The main problem I’ve had so far is with any themes using timthumb.php, which enables the theme to do on-the-fly image thumb creation. Searching around the web I found that due to the domain mapping feature I’ve enabled timthumb.php isn’t able to pick up the new virtual address, therefore you get a 404 error when trying to reach the file.

Mindpop over at http://odotteeaux.com/ found this solution – http://odotteeaux.com/blog/2010/07/30/timthumb-php-in-wordpress-multi-site-and-mu/. It fixes the problem just by overwriting the originally suplied timthumb.php with your theme with this one – http://www.darrenhoyt.com/2008/04/02/timthumb-php-script-released/.

Hope this saves some time.

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