Font Weirdness with IMS Twin Turbo Card Installed

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My fonts do not work correctly with the Twin Turbo Acceleration extension turned on. This even happens in SimpleText. Specifically With Arial, Courier, Courier New, and Old English fonts, the "underscore" key does not work properly-it puts in a "space" instead. Why is this happening?
In general, there have been reports of video artifacting and inexplicable text behavior when the IMS Twin turbo Acceleration is active.

There is not a confirmed known issue at this point. However, the problem is reproducible, and has been forwarded by Anthony Snyder to IMS for resolution.

The only workaround, at this time, is to turn off the Twin Turbo Acceleration.

Machines Affected: PowerCenter, PowerTower, PowerTower Pro, PowerWave
Published Date: Feb 20, 2012