After applying MS Updates on K2 4.6.11 the service crashes:
When starting the K2 service, the following crash occurs:
"Application: K2HostServer.exe Framework Version: v4.0.30319 Description: The process was terminated due to an internal error in the .NET Runtime at IP 00007FFB31E9A55B (00007FFB31E90000) with exit code 80131506"
Removing these MS Updates resolved the issue.
Also see K2 crashes, fails to start, after Microsoft .NET updates.