Dolby Digital/AC3 Support

Hi guys,
Today I updated my Plex-Media-Server to Version 0.9.12.11.
Before that I was able to watch all my media in Dolby Digital.
But afterwards I only got stereo audio. Dolby Digital ist activated on the ATV and on the Plex-Server (DTS to AC3).
Is there any solution for this problem, or is there a possibility to downgrade my plexserver to the last version?

I think you can uninstall your current Plex, reboot your system then go out to Plex.TV click on Download, the look just above the “English” / “Korean” and you should see “Previous Versions”, click on that link.

I’ve used this to downgrade back to my current v.9.11.7

Thank you very much!
I was able to install older versions of the Plex Server.
But none of them worked for me. I tried every release since 0.9.12.6 but none of them hat working Dolby Surround on Apple TV.
Does anybody else have the same issue or any idea how to solve it?

It is now working again. I have no idea what was wrong, but after uninstallin and installing different versions of Plex Media Server it is now running again.
Thanks for your support submarine.