Another idea: What size are the images you grab?
Grabbed images are transfered to VRAM so if you grab too much on a little 4MB or 8MB PCI card, it will just refuse to do it (512x512x32bit is 1MB VRAM).
Don't know, perhaps that is the reason? (old blitz behaved differently at that point)
for AGP this normally isn't much of a problem as most have 32+MB VRAM located as AGP-PCI RAM in the systems RAM.
Grabbed images are transfered to VRAM so if you grab too much on a little 4MB or 8MB PCI card, it will just refuse to do it (512x512x32bit is 1MB VRAM).
Don't know, perhaps that is the reason? (old blitz behaved differently at that point)
for AGP this normally isn't much of a problem as most have 32+MB VRAM located as AGP-PCI RAM in the systems RAM.