Strange Behavior in After Effects UI When Closing CEP Extensions

[max2012181555]

I've observed an unusual behavior within my After Effects user interface that occurs when I have multiple CEP extensions opened consecutively. Here's the scenario:

Opening Multiple Extensions: Whether docked or floating in the UI, if I open multiple CEP extensions (let's say three), everything appears to function normally. If I then close the last opened one, all is good, which is Normal. However:

But:

The issue appears when I begin closing one of these extensions that isn't the last one opened. If I close the first or second opened extension, it triggers an unexpected behaviour: the content of the last opened extensions disappears, and their functionality stops.

Why does closing any CEP extension affect the last opened one? This may be related to the HTML engine, but I'm unsure.

How can this issue be resolved?

Thank you very much.

[nishu_kush]

Hi Max,

What's the version of After Effects you're using, and which OS? Could you share a screen recording of the issue?

Note: Moving this thread from Bugs to Discussions for troubleshooting.

Thanks,

Nishu

[max2012181555]

I've been facing this issue on Windows 10 and 11 while using After Effects 2024 and 2025. The issue also occurred with the After Effects 2025 beta.

https://www.youtube.com/watch?v=8icV1-ORiLU