Encountered an issue with Build 217 and had to back it out. Two users did not have their repositories on the 'advanced search' tab.
Release : 12.1
Component : OUTPUT MANAGEMENT WEB VIEWER FOR ALL PLATFORMS
Add the TCPIP.ForceUniqueOrigin=1 flag to all Web Viewer installations, change the 12.1 Web Viewer Build level to 213 on all servers as the problem is only reproducible at Build 214 and above. Customer OK'd closing with this workaround as the resolution.