No key frames but the position is moving around

There must be something there in the Transform to make this happen.

Can you post screenshots of the Inspector with the Transform area visible, and also of the timeline with the Video Animation? Select the clip in the timeline, press Control-V to show the Video Animation panel, click on Transform and select “All” from the dropdown menu.

Have you applied any effects or any cropping like Ken Burns to this clip?

Please post screenshots showing the Viewer and the Inspector.

It was a probably a glitch, as you say.

Just a quick reminder that when the application crashes its preferences are likely to become corrupted, and that in turn can cause further crashes or misbehavior, so it is recommended to delete the preferences whenever there is a crash.

fliplip wrote:

Ive deleted the Project and started again. So far no issue.

Im aware of how to show Video Animation, i looked and there is nothing there. I am finding the whole Key frame thingy a bit fiddly at the moment, can believe i have to work in such a small window, its very hard to click on them etc, but it was definitely clear of markers

You can scale the timeline up to get a larger size when needed. This can be necessary if you want to make small (I was going to write minute, no pun intended) temporal changes to keyframes. Command-plus, Command-minus work very well for this.