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My powerdvd worked fine when playing YouTube videos. I watched the videos in powerdvd almost every day, some shows length are even more than 40 mins. No buffering encountered via my Fiber Internet connection.

Have you ever cleaned the cache files in powerdvd settings > general page? There is a cache setting that I think it is for YouTube video I guess, or contact cyberlink support for further assistance.
Unfortunately, your salesperson recommended you a wrong software.
powerdvd is a software player. It is not a disc burning program, and has zero disc burning feature.

CyberLink's disc burning program is power2go, not powerdvd.
You can browse all the product introductions on their website: https://www.cyberlink.com.
Per my understanding, powerdvd does not support to decode DTS X or Dolby ATMOS format because Dolby didn't authorize the license, they will be played as DTS-HD or Dolby TrueHD instead if your audio content has the backward compatibility.

Suggest you disable the TrueTheater audio enhancement (right click on the [Eye] icon at the playback control bar) on the TrueTheater panel, and then check the playback result.
I don't have this issue when playing 4K or HD resolution video in non-HDR mode.
The aspect ratio and the video size are both correct (same as what video file is encoded in).

If the symptom happens on certain platforms or video files only, it is too soon to ask them for a "fix".

Update your GPU driver first to check it out, or contact cyberlink support team to investigate the case.
Select the Realtek S/PDIF one > Properties > Supported format to set it up.

The above setting will only show when your playform is applying the S/PDIF Optical audio output on the motherboard.
S/PDIF (Optical) audio output?
Un-tick the Dolby and DTS format of the S/PDIF audio output in the Windows audio settings > playback device.
After the configuration, launch powerdvd to check the playback.
You may try the TrueTheater audio enhancment in powerdvd to boost the movie/voice volume during the playback.
It might get some improvements, but I don't think a comprehensive "correction" is possible.

Right click on the "eye" icon at the playback bar. It will open the TrueTheater effect panel.
Good question.
I remember that the license we purchased on Cyberlink store is for one device only. Not sure of the license you purchased on Steam.
Ask their support for the licensing.
S/PDIF audio output?
Un-tick the Dolby and DTS format of the S/PDIF audio output in the Windows audio settings > playback device.
After the configuration, launch powerdvd to check the playback.
For video file playback, it might have an indicator that marked the last scene you played on timebar.
You have to click the indicator to resume after the video playback has started.
Some legacy made H.264 videos would encode the video content in 10 bit color depth using custom encoder.

powerdvd so far does not support to play H.264 10 bit video. The color or the video will be look corrupted in powerdvd.
The 10 bit support and encoding are much more common in H.265 format videos, which powerdvd supports.
Any tax or transaction fees on the checkout page? Is the price you see a discounted final price, or a price before discount?

If you really need a help on your transaction, I strongly suggest you contact their support team to investigate the purchase concern.

You can reach them there directly:
https://membership.cyberlink.com/support/customer-services.do
DTS 5.1 could be your current solution.

It seems Dolby has done with cyberlink, and so as Adobe Premiere couple years ago.
https://www.cyberlink.com/support/product-faq-content.do?id=24372
You can go to virustotal.com.
It will help you identify if the powerdvd.exe is truly a ransomware or not using perhaps more than 40 different antivirus programs scanning.
https://www.virustotal.com/


powerdvd19 has been released for months. We know it is not a ransomware.

If your PC is not guranteed as super clean before installing powerdvd, that will be another story.
The ransomware comes from other sources else.
It is hard to read your long diary as there is no breaks.

Just contact cyberlink support for your activation concern. Here is user community.
https://www.cyberlink.com/support/contact-support.jsp
My PC worked with the HDR and subtitle fine with poweredvd 19. However it is not an Intel Nuc.

It seems the issue is highly relevant with the graphic processing for HDR.
If your PC is an Intel Nuc, are you able to install the latest GPU driver from them?

There are lots of laptop (using Intel GPU) from different manufacturers prohibits new driver (from Intel) installation on the platform. However, Intel keeps releasing new drivers to fix discovered issues.
It is not a good thing as Windows OS keeps updating that might occur new compatibility issues or security issue as time goes by.
Just tried, Powerdvd 19 supports the external subtitles feature for Blu-ray (folder).
I added a srt during the playback successfully.
Have you enabled the high performance mode in more video settings?

It is for old GPU to run 4K video or use a 4k monitor. The performance mode will disable the snapshot function.
Current GPU won't need this mode to run smooth playback in 4K.

So, disable it if you want to take snapshots.
Technically, there are always steps in detail no matter it is a 10 bit video or 8 bit video, but it is easier to catch the steps in a video that is produced in 8 bit color depth.

55" 4K HDR TV shows it fine in powerdvd as other players:
The steps at upper part is less noticeable, and more noticeable at bottom part.

But, personally, I don't think there are any values to test this specific clip that oddly encoded 8 bit and 10 bit content into single one.
All the videos are already compressed and post-processing during the production phase, the file here is not exactly same as what the original image looks like at pixel level.

We use powerdvd to watch movies but not for scentific color research or testing purpose.
GPU driver affect the final color rendering results between different software player combinations as well.
My playback result is that both upper half and bottom half have steps in powerdvd.
And, the steps at 8-bit bottom half is more noticeable.

The result is the same in powerdvd, potplayer and VLC.
No issues.
Turn on the HDR option on Windows to check it out, and don't forget that all of TrueTheater video enhancements should be OFF in powerdvd.
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