If you really have a LOT of categories and your host is not very good you might be causing some sort of issue with the database. Check the WP error log as CK MacLeod said. If your web host has a log file you can access that could be helpful as well.
If you really have a LOT of categories and your host is not very good you might be causing some sort of issue with the database. Check the WP error log as CK MacLeod said. If your web host has a log file you can access that could be helpful as well.