Server crash when using GUI

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Hello,
I'm using MySQL 5.0.16, WinXP SP2
MySQL Administrator 1.1.5
MySQL Query Browser 1.1.17


I have a problem using MySQL GUI tools (MySQL Administrator
and MySQL Query Browser). It's work fine for two mounth but
now I have problem. I can connect to the server without
problems. But when I try to access database schema (in the
Administrator) or make some simple query (in the Query
Browser) MySQL server crashs down.

The same think using HoneyMonitor GUI.

Some ideas ?
Thanks