There is one thing I could try that would pretty definitively resolve whether or not this is a hardware issue: My motherboard has onboard video that I don't use.  I could try removing my video card, enabling the onboard video, and then running X2 to see if the issue remains.
 
If it does, that would pretty much guarantee that the issue was not related to the graphics card.
 
I'll give it a shot, and will report back.

Yes. Unless the two video systems are similar in nature (same type or brand of chips). Then the test could be inconclusive.
 
Try installing Sonar on a system with completely different hardware.
 
I've tried this before with Sonar and it does indeed have bugs, but it's still worth a try.
 
Steve

The problem still happens.  And no, the onboard video is not based on an AMD chip; it is an Intel design, integrated into the CPU.
 
Unfortunately, that means that the solution is not simply updating a driver or even replacing a video card.
 
There is obviously something different about our systems that makes this bug happen.  After all, some people have it, and others don't.  However, it's still a bug (it's not like this type of thing happens on my system elsewhere).  And for those of us that have it, it happens every time the scrub tool is used, so it's a pretty noticeable bug (see image).
 
Given that I don't have additional computers / computer parts, I can't isolate the bug for Cakewalk.  What I can contribute is this: since it occurs despite switching out both the video driver and the video card, it is unlikely that this problem is caused by a bug in the graphics card or the video driver.
 
How does one go about submitting a bug report to Cakewalk?
 

1. Go to the top of this page
2. Click on "Support"
3. Click on "Contact"
4. Click on "Problem Reporter"
5. Click on "Create A New Report"
6. Fill out the forms
7. Submit the report
8. Record the assigned number so you can track its progress
 
Steve