Two things to try:
First, try unplugging the VA1xA (VA11A or VA12A which ever one you have) and plugging it back in. If this fixes the issue, it could have been dirty contacts or some other sort of bad connection with the video adapter.
The second may be a bit of work to test, but if you have access to another computer, try taking your VA1xA and temporarily install AHP and iWatch and see if the problem follows the VA1xA capture adapter. If it does, then your video adapter may be bad and may need to be replaced.