Okay so i have decided to update this thread periodicaly with any progress regarding this problem as i believe i am the only one experiencing this issue whilst at the same time being close to resolving it.
Update 1. oct 18 14:03....
i am currently stress testing the Capture Card "Roxio HD Capture Pro" with SP1.1 installed, upon experiencing the problem with the Preview Screen glitching out and being unfit for use.
i have removed and re-inserted the HDMI Input Cable that carries the signal from the Console (in my case XBOX 360) to the "Roxio" Device. this temporarily resolved the issue for me after a Re-boot of the software.
This particular issue seems to arise when one or more of these conditions are met.
1.switching from game to game whilst having the program running
2.watching pre-rendered HD videos
3.switching from a pre-rendered HD video to an in game scene
if anyone else has estabblishd that there are other conditions that this issue arises be sure to post in this thread so i can perform my own tests and hopefully come up with a more permanent solution.
Update 2. Oct 18 15:39.....
So i had been stress testing the capture card using the Temporary fix method (mentioned above) and i managed to run a HD video in perfect quality through the preview screen without any problems, until i switched to a Game, the transition from HD Video to a game caused the issue to appear again (quite frustrating) .
so after an hour and a half of perfect quality it has faulted once more.
However by performing the Extraction and re-insertion of the Console to Roxio HD Cap Pro Input HDMI it has returned to great quality again whilst In-Game.
This is not ideal, but it is one step closer to obtaining a "Consistant" Temporary fix and thats something in my view.
I am unaware if Roxio or Corel themselves have knowledge, (and possibly a solution) to this particular issue that could be implemented in an update but i am hopeing that they do.
i hope any of you experiencing this issue with the "Roxio HD Cap Pro" and the preview screen Glitching out are able to make use of this thread, as knowledge of this Temporary fix is something i was happy to figure out and share with you guys.
i will update again if i figure anything else out.