Symptoms
Viewflow is not displaying any workflows.
Diagnoses
After installing K2 4.6.8. Viewflow does not work.
Resolution
After reviewing the Claims Audience table I noticed two entries: One with the machine name and another one with the hostheader name. We deleted the Machine name record from it.
We also updated the claimissuer table for the K2 Windows STS and K2 Forms STS Uri columns to match the hostheader instead of the machine name.
We deleted the extra record from the ClaimRealm using the Machine name for the viewflow RealmURI.
After doing this and restarting the K2 Service and IIS we were able to load the ViewFlow.