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Trouble report 16

General protection fault in module MACXW4.drv

Versions affected



I imported images, then selected perform stitch. The application completed the stitch and finished the thumbnail of the stitch as well. At this point I tried to scroll the lower window to view part of the full image stitch. At this point I got a Pfactory has performed an illegal operation dialog. Selecting details from this dialog returned the following: Pfactory caused a general protection fault in module MACXW4.drv

This is a problem with the ATI display driver. Check out this link for lots more information.


According to the discussions on the forum mentioned in the problem description, the most reliable way to correct this problem is to reduce the display driver's hardware acceleration to the 25% position.

Some people also suggest that you may be able to correct the problem by updating the ATI display driver.

1. Adjust the graphics performance settings.

Use the Windows Start menu (usually lower left corner of the screen) to run Settings->Control panel.

Then double-click the "System" icon.  Choose the "Performance" tab and then the "Graphics" button.

Adjust the "Hardware acceleration" slider to the "None" setting and select "OK" for Graphics and then "OK" for System properties.   You'll probably have to reboot to get the new settings to take effect.

If this corrects your graphics problem, you can try intermediate settings of the "Hardware acceleration" slider to see if there is a better setting that still corrects the problem.

First, check to see if there is an updated display driver available for your display adapter from the manufacturer.  If this doesn't correct the problem, you can try adjusting the graphics performance setting.

2. Check display adapter version.

To find out what display adapter and driver software your computer has, right-click on the desktop and choose "Properties."  Then select the "Settings" tab and click the "Advanced" button.  This will tell you you the adapter and driver version.  You can find out if there is a newer version of the driver by visiting the adapter manufacturer's website at



Revised: April 28, 2004

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