Hello! 

As in the topic, the preview does not change (the image is still) when I adjust the length of a clip - stretch or shorten it - even though the thumbnail of this clip dynamically changes in the timeline (in the preview settings I set "Thumbnails to show in video events: all"). It is very inconvenient to work this way so please help me! :(

I am using Vegas Pro 18 (Build 527) - the Steam version.
I have no preview when lengthening or shortening a clip, no matter what clip it is or what format it is. On the other computer, the same clips already have preview and everything works fine, so it's not the fault of the clips or project themselves.

Computer specs: i5 9th gen, 8 GB RAM, Geforce 1650 GTX.

I'll repeat, the preview doesn't appear when I lengthen, shorten a clip or using ALT KEY tool, but when I press play (or the spacebar) the preview works normally. The problem has nothing to do with the windows layout and occurs regardless of changing it.