Display Issue

I'm having problems with a display rendering some text as in the attached image. It happens randomly and in all applications (Word docs, websites, etc.). First we swapped displays to make sure it wasn't the display, then we replaced the video card, but the problem has persisted.

Has anyone seen this type of video issue before? What is causing this and how can it be resolved?

Dell Optiplex 980
Win 7 x64
ATI Radeon 3400 series display adapter w/DVI splitter connected to one display

Problem enclosed in red rectangle
btnyAsked:
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btnyConnect With a Mentor Author Commented:
So far, fixes described on this website have solved the issue: https://bugzilla.mozilla.org/show_bug.cgi?id=812695
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theras2000Commented:
In short, try a few different screen resolutions.

I've had similar problems before, but it's generally affected the whole screen, not one little portion.  For me the problem was caused by using a non-native resolution for my screen.  Some resolutions match the pixel ratios perfectly for your screen but others force the adapter to stretch and guess because the desired pixels lie in-between what it physically has.
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tailoreddigitalCommented:
I second what theras2000 says.    

It looks like a webpage.   Do you see this happening on other pages?
Have you tried adjusting the browser zoom to see if it affects the scrambled text?
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btnyAuthor Commented:
Unfortunately, it's not just on web pages. It happens with Word docs and anything else with text. The resolution is set to the recommended resolution for the display. Eventually, the text does become clear, but after about 3-10 seconds.
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btnyAuthor Commented:
I just worked with the user and tested the fixes described in the posts from this website.
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