Mask acting weird (turn black and inverting image)

[lumpandro]

I'm trying to refine a mask on a difficult footage, but now the mask is having a weird behaviour while working on it. Suddenly some keyframes of the mask turned black, while others flips the image. I tried modifying the keyframe a little bit by moving mask point one pixel and then it "updates" and "refresh", but then other keyframes started to do the same. 

Working on latest After Effects, under:

NVIDIA system information report created on: 06/18/2025 13:01:31
NVIDIA App version: 11.0.4.148
Operating system: Microsoft Windows 11 Home Single Language, Version 10.0.26100
DirectX runtime version: DirectX 12
Driver: Studio Driver - 576.52 - Mon May 19, 2025
CPU: 13th Gen Intel(R) Core(TM) i7-13620H
RAM: 16.0 GB
Storage (2): SSD - 953.9 GB,SSD - 3.6 TB

Graphics card
GPU processor: NVIDIA GeForce RTX 4060 Laptop GPU
Direct3D feature level: 12_1
CUDA cores: 3072
Graphics clock: 2250 MHz
Max-Q technologies: Gen-5
Dynamic Boost: Yes
WhisperMode: No
Advanced Optimus: No
Maximum graphics power: 120 W
Memory data rate: 16.00 Gbps
Memory interface: 128-bit
Memory bandwidth: 256.032 GB/s
Total available graphics memory: 15202 MB
Dedicated video memory: 8188 MB GDDR6
System video memory: 0 MB
Shared system memory: 7014 MB
Video BIOS version: 95.07.2b.00.0b
IRQ: Not used
Bus: PCI Express x8 Gen4
Device ID: 10DE 28A0 8BA9103C
Part number: 3757 0110

Display (1): Asustek Computer Inc PA279CRV
Resolution: 4k x 2k, 3840 x 2160 (native)
Refresh rate: 60 Hz
Desktop color depth: Highest (32-bit)
HDCP: Supported

Thanks in advance!

[Kevin-Monahan]

Hi @lumpandro,

Thanks for the post. Have you tried disabling hardware acceleration? What happens? Have you purged cache? Have you tried resetting preferences? Let the community know. i hope we can help you shortly. Sorry for the hassle.

Thanks,
Kevin

[lumpandro]

Hi @Kevin-Monahan really appreciate your reply. I purged cache, change to mercury software only and disable hardware accelaration, definitely improved, but I tried to use rotobrush again (first time didn't gave me the results I wanted to, that's why i changed to using masks instead) and when freezing, same problem appears (attached video) rotobrush glitch example 

[lumpandro]

Update - I tried also converting my footage with HandBreak, and tried it rotobrushing with the "new" footage... still the same. When freezing, everything seems normal, when looking at the compositing and render, it all glitches out... 😕

[Dorn27805949mf0a]

I've had the same issue with inverted images, black frames, and  for the past week or so. Usually, clearing the media cache or restarting after effects (in safemode after resseting preferences) would help minimize glitches and visual artificats, but it's currently unberable. The framerate of the video file match the composition, and exporting the footage doesn't remove the glitches. 

[nishu_kush]

Hi lumpandro and Dorn27805949mf0a,

What version of After Effects are you using? Do you mind sharing the project and media file for testing on our end? We're investigating a similar issue so it'll help us to understand if this issue falls under the same umbrella.

Looking forward to your response. 

Thanks,
Nishu

[Dorn27805949mf0a]

Hello Nishu, 

Unfourtunatly I am unable to share the project file I was using, but it was in After Effects 25.3.

I've downgraded After Effects to 25.2.2 since my comment, which seems to have resolved most of the issues I was experiencing.