Hi Joseph, I have a case raised  for this issue (Corel #3984777) My last communication read such:  Dear Hemant,   I suggested a task for you on the 8th March. I have subsequently asked if you have  tried this . A simple answer yes or no would have serficed but no. I can only believe I am not communicating with a ...

I have loaded PS 26 onto a different PC and can confirm the problem is exactly the same.

The effect I am seeing is with both single and multiple clips on the timeline and occurs with m2ts HD clips  and 4K mp4 clips. I am also seeing the problem you describe. 

I have now found the problem is happening when in insert mode.

Very much so. As you drag the display is not smooth and freezes if you continue to drag the clip is still shortened but the display does not show the trim point.

When trimming clips on the timeline. The timeline viewer does not move smoothly as you drag the edges of the clip to the desired point. Draging from the left (to shorten the start) the viewer stops even though you are still draging. Draging from the right of the clip works much better. Has anybody else having this problem? Stuart. 

There is about a 12 dB lift in audio level. Think this originally occurred with PS23 reported to support then and they have been looking at it since with no result.

M2TS audio issue has still not been fixed.  

From the file dropdown - Import previous Pinnacle Studio Projects. I have just imported two projects one from 2006 probably created using PS10 source video 4:3 AVI. The second from 2010 probably created with PS15 source video 1080 m2ts. Some media needed relinking but was otherwise ok. Audio is split from the video, so if making any adjustments ...

Wasted a lot of time trying to fix this. A reinstall of W10 fixed it.