I’m not sure I can help resolve that problem, but I can give you some background info.
When MapPress is loaded it checks that its tables are present and, if not, it creates them (even if there are no maps to display). Apparently when it checked, the database didn’t respond.
I believe the ‘MySQL has gone away’ error occurs when the server has lost its connection to the database or the database is very slow in responding.
I assume that could be caused by a server problem or a database issue. Corrupted tables sounds plausible but it’s too bad MT wasn’t able to help you pinpoint it more exactly.
Here’s the MySQL manual page for the error in case it’s helpful:
Increasing the timeout values might fix the error but I’m not sure they would speed things up. If you think it’s corrupted tables you could try rebuilding or repairing the database: