I am using Windows98 Final US and getting a strange DirectX(?) or display driver related problem: Each time I access DirectDraw applications (media player, starcraft) I get sudden lock-ups with blue screens. I am using a Matrox Millenium 1 (OEM 175m MHz) with most recent BIOS and the offical final 4.11 drivers - i even did a whole reinstall (!) but the problem remains. Also tried uninstalling the Millenium drivers and tried MS's - no change in behaviour. It is not related to PCI IRQ sharing as it was my first thought, i disabled COM ports to even check that out.
Other PCI devices: on-board USB, on-board eide controller, 3Com 90x NIC, 2x Voodoo2 12 MB (no IRQs). Non-PCI-Devices: Terratec EWS64S soundcard, Sedlbauer AG ISDN speedWin card. Board: Asus P2B (BX Chipset). No AGP graphics card yet.
BTW: Win98 always reserves an IRQ for my Millenium1, even it does not need one. I turned it of in BIOS, but Win98 does not care. :) Same with USB.