Graal failure?

[GrowlZ1010]

My Graal has suddenly started acting weird... starting it up gives me the normal Graal login window. I click Start. The server list loads okay. I click Graal2001, and I click Connect. I get the Graal window filled with blank grayness. Ctrl+Alt+Del is needed to make this go away; after I Ctrl+Alt+Del Graal once, it stops working for the rest of that Windows session, quitting with illegal operations in "module <unknown>". After Graal quits, another program (a system service, as this one didn't appear in the Close Program box) DDHelp.exe performs an illegal operation in "module <unknown>" again. I've just checked this out and DDHelp appears to be a component of DirectX. Rebooting will make Graal work again for all other servers except Graal2001... I've tried re-installing Graal's executable, but that doesn't work either... what's going on!?