Unmix stem weirdness

I am still waiting for Steinberg support to get back to me and acknowledge this issue. I really would like some help, though, since these projects have been working without any issues at all until this started…

Since SL Pro works from inside Cubase Pro, I think this issue has to be addressed by both Cubase and SL Pro support.

Could this be a graphics bug?

Robin, any more ideas? Any help you can offer would be appreciated.

Best,

Magnus