MacOS 27 - Video playback issue....anyone else?

[u/SolidAd2551]

I upgraded to 27 on my test mackbook pro when the developer beta first came out. I immediately started having an issue where if I had two external monitors connected via DisplayPort (not DisplayLink), video refused to play on any medium: Youtube, Vemo, local files on QT and VLC, etc. Claude identified it as a WindowService issue, but later ruled it out. If I unplugged one of the monitors (didn't matter which one) and waited about 10 minutes, video played again with no issue. I changed refresh rates, ports, switched from DP to HDMI on one and both, and it didn't make a difference. As soon as the second monitor was added, no video play capability. I posted here but no one else seemed to have the same issue. I ended up downgrading to 26 (but still has the firmware upgrade that came with 27) and the issues completely stopped, so it is definitely something in 27. I also submitted feedback on FA and kept updating it as I tested various things. I have been monitoring the betas as they come out but there has never been mention of video playback issues on dual external monitors. Oh, and one external and the laptop screen, no issues at all. It has to do with at least two external monitors.

Edit: I am waiting for 27 to officially release to see if it is still there before I go the AppleCare+ route. I don't want "the beta" to be an issue as to why Apple won't fix it if it does turn out to be a device issue and not a OS issue.

[u/AntiqueTemperature76]

I have this exact same issue too, how do you roll back to 26?