hi congrats on your first post and welcome to miggy.org
Your running out of video memory.
My Mediator and Voodoo 3 does that when:-
Open more than 3 screen 1024*768*15 Bit
Or Have the TV running full screen on its on screen then Flick back to WB and open a window. the Window gets trashed.
I was going to playabout with the setting, but i cant be bothered as my A1 G4 will be here in about a fortnight. Could try putting the jumper down to 4MB window.
Ask on the mediator mailing list
