Just to confirm, do you mean when you drag the table window to move it to a different place on the screen, or when you are moved to a new table in a tournament?
It sounds like the first, which would be really strange.
What version of Windows do you have?
If you're using Vista or Windows 7 I assume you already have PAH and your site running as Administrator?
Attention Microsoft Vista UsersIs there anything unusual about your setup - multiple monitors, virtual machine, anthing like that?