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My problem has been solved!
Although the "fix" eludes logic . . . at least to me. 
The story:
My wife recently purchased a new digital camera [a fairly high-end model], used it and then went to transfer some images directly from it to one of our desktops. [Windows 8.1 desktop, running the current version of PowerDVD 15 Ultra].
After she had finished using the desktop, I had run Windows Update (manually, see my comment below) and among the few updates listed was this: Microsoft Camera Codec Pack for Windows 8.1 for x64-based Systems [for those interested it was this update: (KB2899189)]. Said camera codec pack installed with no issues.
NOTE: Since my last post regarding this issue, this desktop has had NO other updates/changes/modifications to it (I never allow any "automatic" updates and/or "automatic installs" of any kind on our windows machines. So I am certain nothing else has changed.
I opened up PowerDVD a few minutes after the update completed, as I had another idea for trying to "fix" the suttering video issue (i had already planned to do this before the camera codec update). I opened up a vid file that I knew 100% stuttered in PowerDVD, but not when using any other software . . .
. . . lo and behold, NO stuttering! No issues of any sort. Beautiful video and smooth playback. I randomly tried 12 other videos of various formats (all of which I had tried previously, and all had stuttered) . . . ALL worked perfectly.
Why this worked, I do not know. The codecs installed by KB2899189 didn't seem special, or "wow, I can't believe I never installed that codec!" type of thing.
As I said previously, this machine has had no other changes/updates etc---only my wife and I use this desktop [it's in our master bedroom]---so I can only "assume" that this random camera codec pack inadvertently fixed my issue.
Comments?
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Micke00 and blasiusxx,
Thank you for your replies and suggestions.
@Micke00 --  good suggestion on the "alt + tab", but that's more of a Windows remedy (a selecting of the top-level [or active window]/"resetting of what Windows thinks is the "top-level"/active window when multiple windows/tasks are open on the desktop/residing in the system tray). I tried it, because as I said in my op, I am open to any and all ideas/suggestions/possible fixes. But, alas, it didn't work.
For me, my problem in using PowerDVD 15 Ultra is a subtle-yet-noticeable-and very annoying-stutter every 6-8 seconds while watching video files. Not a significant stutter/jitter that a hung/or conflicting "top-level" window issue can cause. And as I mentioned in my op, Blu-rays and DVDs play 100% perfectly and quite beautifully.
@blasiusxx -- I sense a great deal of frustration from you and PowerDVD--and I absolutely empathize with that!  I'm currently feeling that way as well.
I'm familiar with MPC-HC and it plays media quite well. Great suggestion as an alternative. Very similiar to VLC, Zoom Player (the free version), SMplayer et al.
Oddly enough, our daughter is using my wife's old laptop (a 2yr old HP) and it has PowerDVD 14 Ultra on it, and it doesn't have this problem whatsoever. My daughter routinely watches Blu-rays, DVDs and all sorts of video files (H.264 mp4, mkv, mpgs, avi etc.) without any stuttering/jittering etc.
I'm hopeful (naive, perhaps?? ) that this issue can be solved for every one . . .
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I've been battling this same problem for quite a while. I try some "fix" and it "seems" to work, but then . . . no . . . I still get a slight "stutter" when watching most video files (i.e. mp4, mkv, mpg, etc.). Blu-rays and DVDs play 100% perfect.
It's not the encoding of the above video files that's the issue, as they all play 100% smoothly on other players I have---like jRiver Media Center 21, Zoom Player Max, VLC.
I also should state that I purchased 3 PowerDVD 15 Ultras---2 desktops and a laptop (all running different OSes, vid cards and from different computer manufacturers). So it's very very unlikely it's an OS or comp manufac. issue.
I've tried every "fix/suggestion" I can find---NOTHING has yet made a difference.
Things I have done:
--uninstalled [using an agressive unistaller porgam to remove every bit of Powerdvd 15 ultra]
--re-installed the basic build of the program, then incrementally installed each update---and testing a video at each point
--rolled back my graphics drivers (I have a GeForce GTX980 card on the desktop I was doing all this with)
--turned on/off a vareity of features within power dvd [like the video enhancements, hardware acceleration, etc]--and tested each change
--swapped out the HDMI cable from the comp to the monitor to a DV-D cable [a cyberlink tech INSISTED that the hdmi cable was the problem (????) and of course that made no difference either]
--turned on/off a variety of features within the graphics card control panel--and tested each change.
NONE of the above things I tired corrected the stutter problem.
My only recourse has been not using my expensive Power DVD 15 Ultra I paid for; but to use the other software I mentioned above---2 of which I paid for as well (jRiver Media Center 21, Zoom Player Max)---and the free VLC player.
All of these are excellent, but so far, none beat the picture quality of powerdvd--jriver and zoom come very close (about 95% close).
Does anyone have a fix that worked for them? I am utterly open to just about any idea/suggestion/etc.
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