After updating a multisite network to 3.2, all of the post permalinks were getting 404 errors. I manually went through, clicking save on all of the permalinks settings on each site, and everything seemed to be working after. Following that, i had to uninstall a plugin, events manager extended. I didnt do anything else, so i can only guess that recreated the problem, because now posts are again getting the 404 error. Im wondering if this is something i can resolve someplace like htaccess so i dont have the problem everytime i activate or deactivate a plugin, and, if there is a way to resave the permalinks across the network, so i dont have to keep manually doing it for 100+ sites. Thanks for any help!