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When I built my new PC and reinstalled PD I can no longer click and drag clips onto the timeline, I have to click add to timeline and sometimes when I add to timeline the program crashes.
You are possibly experiencing the same issue I am. Especially if the videos are in h265 format. A temporary workaround was discussed in my thread on this topic:
https://forum.cyberlink.com/forum/posts/list/85782.page
but the reality is...CL is using paying customers like us to alpha test this program. It hasn't been right since about version 17. You either get rampant crashes, features removed, or other annoying quirky issues that probably will never be fixed as there are still some issues from version 18 that aren't fixed.