Ae Rotobrush keeps propagating over and over again?

Hello, my fix was to use Rotobrush 2 instead of 3, and use shorter clips. After the initial rotobrush (first outline) I move frame by frame (cmd/ctrl + right) to make sure the outline stays in tact. After a few frames I'll press space. Then freeze after one loop

The long awaited SOLVE, an immaculate dicovery, the extensive workflow allowing you to keep as many rotos as you want in your composition, unlocking max power and ENDING auto propagation from your roto brush comps ....

STEP ONE: LOCK YOUR LAYER.

Lock the layers using roto brush and the problem is fixed.

Thats it. Enjoy

Rotobrush keeps re-propagating try freezing the roto to stop it

following;

1. Freezing the roto once done.

2. Trimming the comp to needed frames.

3. Clearing cache if it best loops.

Try freezing the Rotobrush after refining. This stops it from re propagating.

If AE Rotobrush keeps propagating, try freezing the frame after refining, or clear the cache and restart the app.

What worked for me, I had a very simple video 5 seconds long with high contrast and barely any movement, was usign rotobrush 1 instead of rotobrush 3. For some reasons rotobrush 3 didn't work at all, it would go into loop rotoscoping for hours. I tried frame by frame, it would still mess up everything after hours of frame by frame work. Rotobrush 1 solved the issue. I have now successfully rotoscoped my first clip. 

Just my two cents on this, as I've recently been running into the same problem:

It seems to be a RAM issue. I think, at a certain point (and this might vary with different RAM setups from 3 seconds into the clip to 6 f.i.) After Effects seems to forget the previous propagation and starts all over again and then it is not possible to go on with the roto job unless doing some of the suggested precautions (splitting up the file, precomposing, cropping to area of interest …). One thing also mentioned here or in another thread: You mustn't have any other layer activated than the roto layer. Otherwise repropagation will be triggered even sooner. What might help before splitting up the clip, though, is to apply a new starting point for propagation. To do this, I shorten the right marker of the green rotobrush span to the frame where the issue arises. Then I proceed one frame. There is no roto mask now and I paint a new one. Now I can go on from that point and repropagation will start from this new base frame when triggered and not from the very beginning of the clip. However, why is it not possible to apply the current roto mask to a new base frame without redoing the whole masking procedure? If I'm missing something, please let me know.

For me I just didn't have enough RAM, still if I slap a lot of refine edge and have Premiere pro open alongside AfterFX I have to remake the whole thing

Hi, I've the guy who wrote the comment with all the upvotes on it on page one.

It's been a couple years, but I stopped getting this problem about a year ago when I stopped pirating After Effects and started using a legitimate subscription. 

If you happen to be pirating the software and you get this issue, try buying a subscription and see if that works.