Nor had I - really odd as it just started recently. I discovered a couple things (which may be the way I am applying clips etc, although not sure). It appears to happen most when a graphic/title is placed in another video track and then adjusted or removed. And always after I render the project and then go to make changes to that section after a review. So it is as if the "rendered" project cannot then break apart the video/image(s) when I go back into the timeline and re-edit. Not sure but that is my guess. It is not consistent.
I may try resetting preferences. I had already tried trashing media cache but that did not resolve the problem – at least when I attempted once. However, and this is odd, I have attempted to remove the clip(s) and just pulled the same clip from the bin placed in timeline but to my surprise the anomaly, or 1 frame residual, was still there. So I resorted to remove all the affected clips, left a gap in the timeline, save the project, close PP, reopen PP and then apply the clips back in. That seems to work.
I figured out some lengthy and time-consuming work arounds, but it is all just odd and may be something inherent in my system. I had to downgrade both PP and my OS to work on very old media for a client. (Which you, Ann, gave me the info needed to know how to handle that old media several months back.) In any case I was just curious if anyone had ever experienced this before.
Thank you so much Ann - you are always so quick to help out and respond. Really appreciate it..