After upgrading MySQL from version 5.0 to 5.5 I started getting the following message trying to edit table structure in Navicat:
Cannot load from mysql.proc. The table is probably corrupted
Luckily there is an easy fix. Run the following command from the command prompt (on Windows you might need to run it from MySQL’s bin directory).
In some cases you will need specify mysql root password and –force option (if you run upgrade procedure already).
mysql_upgrade.exe -uroot -p