I have discovered that in the latest version of After Effects 2020, I get a "data not found error (33:4)" message when trying to open a file where the roto brush was used. I've tested this extensively, and it's definitely the roto brush that is causing the issue. Any file which uses the roto brush effect will not open after being saved. I suspect AE is having trouble finding the roto brush data, but there is no way to fix the problem as the files won't open at all. This has caused a fair amount of lost work.

Just upgraded to 16.1 and I can no longer access my external monitor. Mercury transit automatically switches to "monitor 2" when I need it to stay on "monitor 1" even after I reset my preferences.

If Rotobrush is applied in anyway, after saving, closing and restarting the project won't start.
Returns an error: missing data in file

In the latest update, RAM preview is broken. It will cache frames but never finish or get stuck locking existing frame. even when cached, playback is not working. I have to scrub everything right now. I've reset the RAM preview pane state but same results.

When exporting from After Effects 2020 or a Premiere Pro sequence that has a AE sequence inside, AME 2020 crashes when trying to export.

See https://adobeproblems.wordpress.com/2019/09/16/daily-adobe-quirks-media-encoder-failed/ . Having the same problem on macOS Majove on an iMac Retina 5K, 27-inch, 2017.

Two project files I created on CC19 this week and continued to work on in CC20 are unreadable after saving and re-opening. On CC20 the error is 33 § 4 (Missing Data). This also applies to the render process in AME which can't start.

The same file opens correctly on CC20 in OSX and CC19 on Windows as well.

Other files created in CC20 are opened without any issues.

Bug report. When opening projects created in previous versions and the re-saved in 17.0.1, receive error message "After Effects Error: missing data in file. (33::4)". Only solution is to revert to 17.0.0.

I have been working on After Effect for many years since variation 3.1. I've never come across such a thing. Projects that open without problems in version 2019 cannot open at all in version 2020. When I open a project - The process then begins and then the program collapses. I've done tests and prepared only one-layer projects in version 19 - and those didn't open in version 2020 either

using a null to mark MPB of a song.
When I copy it from one compo to other... AE crash...

2020 Bug. Please fix.

Error 33 :: 4

Corrupt file and also saves are lost.
Two days struggling to do a job, sleepless nights and I checked my limit.
Adobe Help.
I need a solution

Since the 2020 update, when you try to import several JPEG images into the project, some of them are the same image, even if they keep their correct names.
For example I export images called "01", "02", "03" and "04". When I check them in the timeline, "02", "03" are the same images (they have the same visual content) but with different names. The problem doesn't happen when you export the same images but in PNG instead of JPEG.

Crashing after importing PSD one frame layered footage about 4000x4000 px and trying to open the footage... Boom, crashed!

Every time I try and save a certain project, no matter the amount of progress since the last save it will get stuck on 0%, and then eventually crash, making it impossible to use and preventing me from finishing client projects for work. Not all that impressed.

The latest 17.0.2 did NOT correct this. 17.0.0 thru 17.0.2 does this on all my AE projects with Key Cleaner (it might be when it is used in conjunction with Advanced Spill Suppressor, but I'm not sure). I had to downsave all my AE projects to the latest ver. 16 in order to continue working. Am I the only user this is happening to?

Unlike all other properties, in this property "matchName: ADBE Text Expressible Amount" the expression does not update itself if you change the name of the effects it uses.

AE2020 appears to have a bug when opening project with footage that has Warp Stabilizer applied. Windows 10, Nvidia RTX2060.

Steps to reproduce: In AE2019 create comp, import *.mov ProRes422, apply Warp Stablizer, save project. Close 2019, open project in 2020, RAM preview is broken.

After Effect v. 16.1.3

When I double click the text that I want to edit and go to the fonts dropdown to change the font. It opens normally, like it should.However, as soon as I press an arrow key on my keyboard to navigate through the list.. it immediately crashes.

This is very annoying as it happend a few times now which results in losing some progress over and over again.

I'll stay away from the arrow keys until its fixed ;)