Hello jcrow,
i would recommend to take a look into the agent output at that time the error occurs.
There is propably an error message or even no output from the plugin at all.
If you see at least each section at least once in the agent output, you can be sure that the script is running, because the plugin gives out each section once (line 107, mysql.vbs).
I think, this is the best you can do for now, because there are to few information to do anything more.
Regards
Kruzgoth