Some Companion users have reported to me that the Ember+ Provider in Companion 4.1 does not work with VSM. After downgrading the library from 0.3.0/0.3.1 to 0.2.2, it starts to work again.
They say that ember viewer works fine, but not VSM. As far as they can tell it wouldn't connect.
As far as I can tell from the git history, the only change made in 0.3.0 was #43, which does appear to have made changes in the S101 logic, suggesting that something changed there is causing the issues with VSM