Link(s)? I've read about issues with defective glasses, but not with the displays.
The DLP pixel speed is about 16 microseconds, compared to plasma at around 16 milliseconds. They are mirrors, so there is no residual image decay as with LCD and plasma pixels. Besides that, the "wobulation" mirror shifts every 120th of a second to display each eyes view one at a time, so it is impossible for both views to be shown at the same time. The only ghosting that can occur would be due to improperly synched glasses.