I'm still getting no 2160p audio with 5.0.031. However, I've found a separate problem with OpenVIX, and it has happened several times: waking the SF4008 after it has been in standby overnight, I find that all multistream channels have vanished from my satellite lists for both 5.0W and 12.5W. I then have to restore them from a backup. Non-multistream channels are unaffected. However, if the receiver was tuned to a multistream channel when it was placed in standby, channels on that transponder are not lost. I'm using the default version of satellites.xml, which includes all the multistream transponders on both satellites.
This has happened also with versions 027 and 029. I'm now trying to replicate it with (for the sake of an example) OpenATV, but so far all multistream channels have stayed put.