Issue 7: "An Unknown Error Has Occurred"
Project Member Reported by kevin.beaumont@gmail.com, Apr 9, 2014
ZOS support: Can happen for a variety of reasons.
Causes being investigated.
Apr 9, 2014
Project Member #1 kevin.beaumont@gmail.com
This was happening to EU users regularly.  On April 8 2014, the EU megaserver was offline for an hour to fix that issue: http://forums.elderscrollsonline.com/discussion/72664/eso-maintenance-eu-megaserver-4-8-complete

So far NA has not had that maintenance window.  This does not mean NA megaserver needs same changes applying.
Apr 15, 2014
Project Member #2 kevin.beaumont@gmail.com
Attempts have been made to make the error messages more user friendly in v1.0.3.