Yes I have. That was the only way I could see the timeline preview at one point. I have tried multiple source clips and if it is not one continuous clip past 37s it goes gray randomly. PS25 is buggy

I continue to find bugs in PS25 including this one that is pretty annoying. Also note once you zoom in what is rendered is different than is show on the timeline preview. You have to allow more space, etc.  Can we just get PS24 installed and call it good? 

All great suggestions, but I want to provide more info. I feel like this might have something to do with it. I had imported 12 videos via link that are all around 5gb each. Even after moving the clips around, etc. I kept noticing it was doing to the gray circle about the same time on the timeline. First one is 37seconds in no matter what clip is ...

Now that I have my Timeline Preview working, I am trying to make a highlight film for my daughters soccer team. I can take one of my rendered games and pull 5 clips from it. When I preview it in timeline it works fine. When I export it, 1 or 2 of the clips exports with a Gray/Brown circle pic and the other clips from the same source export fine. ...

AND DAVID for the win! I disabled Intel video card in device manager and the preview started working! BAMMO! Great job thanks all for the advice!

How do I switch which graphics is active when using PS25?   Watching task manager processes...when the source preview is playing PS25 is showing 4% usage, at idle it is showing 0.1% usage, when I play the timeline preview the usage goes back up to 4 to 5%. The computer seems to be rendering and playing but the software is not showing what ...

I downloaded and installed the mpeg2 extension. It did not help the PS25 issue.   Just so we are clear on the issue, I uploaded a video to youtube. Thanks! https://youtu.be/miYgG9tx48k   

Hardware acceleration is set to Cuda. I have tried them all. Autodetect sets it on Cuda.  I tried to update graphics drivers through device manager for both intel and nvidia and both stated they already have the right drivers installed. 

I agree it is the same. I had not ran the DXSETUP.exe great catch! I ran the setup and then opened PS25 and I have the same results. I don't understand why it will play it in the source preview window, but it will not play it in the Timeline preview window. Did you see my not on the WinAudit and the MSINFO32 request from Corel? Does that sound ...

Being my last machine was not half of what this machine is, I didn't figure that mattered. I added it in my signature.  When I installed, there was a sample timeline built. None of it worked either. I have tried .mov. .mp4, and many others made by drons, camcorders, go pros, etc. with no luck.  It is not a single file issue.  I ...