I am running Vegas Pro 20 (build 326). When I place a video clip on the time line and play it, the video plays ok in the Video Preview Window. However, If I check the box to enable External Monitor, the Video Preview freezes, even though it is playing fine in the External Monitor. As soon as I uncheck the External Monitor box, the video in the Preview window resumes playing as normal. The video also freezes whenever I open any other window such as Text Box editor. This is very frustrating as I cannot see the size and placement of the text in relation to the video until I close the Text Editor window.
I still have Vegas 19 Pro (build 636). A similar thing happens with the Text editor, but the Video Preview does continue to play when I enable the External Monitor which causes it to freeze in Vegas Pro 20.
My system is as follows:
Win 10 Pro (22H2 - 19045.2728)
Core i9 - 10980
nVidia GeForce RTX 3070 (528.49)
Some have mentioned that it may be an issue with the video driver, but again V19 does not have the same issues as V20