You can resolve this issue by going into Sound Forge's Preferences and checking the two "Compatible draw & scroll modes for broken video drivers" option boxes. The waveforms are fine after this, but note that you'll get a delay between the scrolling bar and the actual sound feedback.
Later edit: I found out that this delay only happens when you're on the default zoom level. If you're zooming a little on the waveform, you get realtime playback and scroll.
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