I installed b4 last night and as soon as I did, my VeSync integration broke ("Failed to set up"), and 10b5 hasn't fixed it either. From some Googling it looks as if there's been an issue with it for a while that massively predates the beta, but which apparently a newer version of HA (I think this one?) is meant to fix. Tried removing it and re-adding, but it says "Unknown error occurred" when I try to log in.
I have SSH access, but not sure how to try downgrading. Am using HAOS on a Pi.