>>I have a VFP application (VFP 5.0a Build 415) running under NT Workstation 4.0. The client is experiencing occasional crashes where FoxPro shuts down and you get an NT error message: Exception number: c0000005 (access violation). There is no pattern to when the app crashes -- at least as far as I can tell.
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>>I spent some time researching threads on UT regarding this problem. (Thanks everyone-- the comments were most helpful!) I was encouraged to concentrate my research in the video driver/printer driver areas. HP has suggested a couple of LaserJet drivers to try in place of the Laserjet 4si MX driver currently in place. (Though HP claims that all the NT drivers for LJ 3 and 4 series were written by MS!)
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>>My problem is on the video driver side. The woman at Microsoft tech support suggested using the generic VGA/SVGA driver in place of the ATI 3D RAGE PRO AGP driver that came with the Dell computers on which the app runs. (I checked ATI's web site -- I have the very latest driver.) My problem is that the app has large forms with many controls -- you cannot run it properly a resolution less than 1024 x 768. This rules out testing with the generic driver which only
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>>goes up to 800 x 600. The problem only occurs a few times a day, and the client is not willing to do testing with a different video driver if she cannot see the full forms (sounds reasonable to me).
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>>I have sent e-mail to ATI, but they have not yet responded. Can anyone suggest any video drivers known not to tromp on VFP's memory space that would let us get 1024 x 768 resolution (color depth can be low; doesn't matter here)? Any other thoughts or suggestions would be appreciated. TIA
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>I don't have any specific experience with the ATI Rage AGP card, but I do remember we had a client site reporting problems with it - they had to turn off some of the video acceleration options in Control Panel/Display/Settings/Advanced/Performance. He was not pleased with the result for some of his graphics apps. As I remember, he's now using the Matrox G200 AGP card (fairly cheap - about $150 for an 8MB card for the OEM version) and has had no complaints since the switch.

Ed,

Thanks for your response. I was away for a couple of days, so I am late in responding.

Just before going to see the client on Thursday, I got a response from ATI's tech support. The response was helpful. The fellow suggested that I could downgrade the video driver (and hopefully avert the problem) by using an older Rage 2 driver for NT. (He also suggested that since this machine uses a Dell implementation of the ATI chip on the motherboard, that I really should use Dell video drivers -- not ATI. The client is using drivers off the ATI web site.)

I have given my client a log so we can record the frequency of access violation error messages, and we are trying the older ATI Rage 2 driver. I will keep in mind your suggestion about the Advanced Settings/Performance dialog. Fortunately, this machine is not running any high-powered graphics applications, so they may never know...

Steve