Preview is stuck in a loop and is unresponsive

I tired installing an older version. Just a couple dots back since everything other program is working, and that is seeming to work tonight. I can at least work and move forward. So until they fix it I just went back a couple versions and I can actually get stuff done.

Same.
Windows 10 Pro
AMD 3900X
64 GB RAM
2x 2080

Also, playback speed is horrendous too. Can't play a stready 60 fps 1080 composition in a 4K monitor if any interface is showing.

I have the latest version of AE 2020 (17.0.6) and I still have problems with playback which none were present in 2019. I push spacebar (or from the preview menu itself) to preview, it starts but then it wont´t stop, I have to force quit the program, this only happens with the Windows version, in MacOS it works fine, I just had to move my entire project to MacOS because otherwise I could not work. PLEASE fix this, after many updates of 2020 this bug/issue persists!
That's what happens when it plays the preview, sometimes it just won´t play no matter what, I have to close ÁE, open it and preview again and do that process all over again everytime it won´t even start the preview.

I've just stumbled across this bug in 17.0.6 (Build 35). Its only started doing this. Soo Annoying!

i have had problems with Audio device changes and then no ram preview working as well.

Windows 10 Pro
AMD Threadripper 2950X
64GB Ram
Nvidia 2080ti

What kind of file do you need to see more system info?

Not really a fix, but I was having the same issue. After creating a new project file and reimporting everything from the old project file everything previewed normally again.

PLEASE STILL FIX THIS FOR REAL ADOBE. Hours lost trouble shooting this.

I have been able to reproduce this error.
1. Toggle ON the "show overlays and layer controls" option under Spacebar Preview
2. Ram preview using space bar.
3. When the work area is fully cached, hit spacebar to stop
4. Press spacebar again to play back the ram preview, and often the playback will get stuck (I can't stop playback and have to force shutdown AE).

I'm not sure if these factors are important, but I had several Null objects with position data applied to them. I am working at 32bpc in full res. Playback is also set to loop, not play once.
I am on Windows 10, AE 17.0.4, NVIDIA driver version 430.86 with a NVIDIA Quadro RTX 6000.

Happening here on a Windows 10 with studio AND game ready drivers, so not resolved. Also, playback speed has definitely taken a hit and many of my students can't ever hit full speed so much so that audio doesn't even play (when using don't play audio if not full speed).

Known issue. This should be fixed in an upcoming version.

Same problem with After Effect 17.0.5 on Windows 10, Ryzen 3700U with Vega 10 GPU.

AE16 is working like a charm tho.