Instruments Panned Left after Update?

After the 4.3 update, on a new score, all the instruments are sounding to the left speaker, for no apparent reason. The mixer looks fine. On closer inspection, it’s coming out of Halion like this. I see no apparent way of changing it. This is also happening when loading older projects.
Any ideas?

This sounds like the thread here

Yes, please follow up with Ulf and the other users with a similar problem in that thread.

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