Interesting. For how long was the HUD displayed that way? Has this happened repeatedly?
Apparently the game client did not receive all of the data necessary for the missing parts of the picture. During the 5 years I have been playing TESO, occasionally I have seen similar output from the game client. Usually there seemed to be a problem in the mega-server system. However, sometimes, it could occur as the result of a service interruption caused by the ISP, during which my computer lost connectivity to the Internet for a few milliseconds. The interruption was not long enough to cause the game client to lose its log-in to the mega-server, but it would cause a gap in the input received by the game client.
--- Shadowshire .......... ESO Plus on PC NA with Windows 7 Pro SP1