Video clip is MP4 - 1280x720 - 29.98 fps
Highlight it in the timelime and select 'Modify' and then 'Fades' - ''Fade Out'
'Save' back to the timeline and the clip is squeezed up to an approx 4:3 ratio in the preview window.
Click on 'Modify' again and without changing anything 'Save' it again and the clip is squished up even more.
Eventually the clip is squeezed by a ridiculous amount.Seems to be a glitch within PD which if anyone else can replicate may prove it to be so.
Cheers - Don Windows 7 Ultimate 64-bit,
Processor: Intel i7-2600K CPU @ 3.40GHz (8 CPUs)
Memory: 16 GB RAM
NVIDIA GeForce GTX 1050
120 GB SSD
Drift Ghost S Headcam