Did some troubleshooting and found out its not a game causing the issue. It's Google chrome canary.
Can't get the error to come up any other way, but if I start Canary, even if I block it from the internet, SVP won't work. SVP restart won't help as long as Canary is open.
Tried it with all plugins and extensions disabled, no difference. Just having Canary open "disables" SVP.
Active log is identical with working and non-working instances.
Of course, since Canary is quite experimental, I don't expect SVP developers to react to the error it causes. But this helped me greatly now that I know what causes it. No need for reboots or logoffs anymore