Hi, I’ve been having the same exact issue for the last couple of weeks, before that, it was working just fine.
I’, using v. 4.23.0, but I tried with others (4.22.3, 4.11.2 etc) and the result is the same, a grey background and logo blinking every time I try to open Substance Source plugin.
If anyone knows how to fix this, please, let me know,
Thank you, guys.