Transform Points problem

[ZeroAbility]

I have a recurring issue with the Transform Points tool in Moho 13.5.5.
Looking for help, solution or cause. Thanks.

The current issue is happening on Frame 599:
There are keyframes for Point Motion and Point Curvature at Frames 591 and 605. So, both before and after the current frame.
I select a Vector Layer and choose the Transform Points tool with the intention of moving some points on the layer.
As soon as I click any point, the entire shape changes and a new Point Motion keyframe appears.
The new shape is not random, it exists elsewhere on the same timeline, before Frame 591, but it is not the shape from the previous keyframe,
and it is not the Frame Zero shape either. It is also not a keyframe from the clipboard.
Once this happen the points on the layer are no longer editable in any way.

There are no bones or smart actions in the project.
The Vector Layer in question is a Mask Layer.

This problem doesn't happen in every project, but it does seem to happen quite regularly.
The only way to fix it (but only temporarily) is to delete the entire layer and copy/paste it from a previously version of the file.

Does anyone know why this is happening?

[ZeroAbility]

Here's a short video of the problem.

[Daxel]

That is strange. I don't seem to have any notes about this problem. Could be related to bezier handles as I don't normally use them.

Have you tried fixing negative keyframes? It doesn't look like that's the problem but who knows.

Let's hope someone can help us know what's happening. Sharing the file usually helps. You can delete everything except the problematic layer.

[ZeroAbility]

The vector object does use bezier handles, yes. Hmm.

I'm not sure what you mean by negative keyframes. Some layers have been moved in the Sequencer.
Do you mean fixing keyframes that may appear before the beginning of that layer's start frame in the sequencer?
I'll have to check, but it is possible I have keyframes like that.

[ZeroAbility]

OK, I did have a keyframe on frame 1, but the layer begins at frame 13 in the Sequencer.
I deleted that keyframe but it didn't make any difference.
I also deleted ALL keyframes except for the ones just before and just after where I want to add a new one. No difference. Problem still occurs.

[Daxel]

No, I mean negative keyframes that are keyframes placed before the 0 frame independently of the sequencer. It happens rarely and causes corruption and problems. It is easily fixable thanks to a script made by synthsin75. You can try it here:

https://www.lostmarble.com/forum/viewtopic.php?t=32714

Deleting things (keeping a backup) it's also a good way of reducing the possible causes of the problem, like you are doing. Maybe you can try deleting the previous or the next keyframe, or only the curvature keyframes, and see what happens.

[SimplSam]

I have just seen similar bad behaviours on a smaller scale in 13.5.5 with a single layer with a shifted sequence, where I get to a state where I cannot move the points in the later frames, but It's OK on shifted 'frame 0'

[ZeroAbility]

Thanks Daxel. I will try that script.

I managed to get my scene finished from my backup. I was just doing final tweaks to it anyway.
I had to do some fudging to get there. It's not perfect, but it's good enough.
The 2D frames from Moho are part of a 3D Blender scene and moving all the time, so I'll get away with what I have in this case.
Thanks for your help.

SimplSam, yes, that looks like something I have experienced as well.

Here's a clip of the end result...

[Daxel]

I have just seen similar bad behaviours on a smaller scale in 13.5.5 with a single layer with a shifted sequence, where I get to a state where I cannot move the points in the later frames, but It's OK on shifted 'frame 0'

Ah that looks like the most probable cause. I almost never use the sequencer (I just move the keyframes) so it makes sense that I didn't see it. I will add it to my notes.

Here's a clip of the end result...

That looks very cool!