Cannot move objects in timeline on layer - objects snap back
Hi, new to animate but this seems pretty basic- I can get so far through an animation on a particular layer - successfully moving objects on to the canvas and adding tweens (alpha/fades). So far down the timeline (around 2200 frames) however, the timeline becomes dark grey and if I move an object onto the canvas, it snaps back to its origin, leaveing a blue outline box where I wanted it. If I try on a light grey pat of the timeline before this, it's fine.
I've re-installed Animate - same issue. I've tried deleting the dark grey frames, and adding new frame to place the object, but the timeline always appears as dark gey/cannot move objects were I want them.
It's a basic 'animation' - just tracklist text appearing then fading over a background for a 45min or so audio mix. I've tried working on a new layer - same issues - tried resaving the file - same issue.
