The maintenance is complete, and the PTS is now back online and patch 10.0.4 is available.
Maintenance for the week of May 13:
• [COMPLETE] ESO Store and Account System for maintenance – May 14, 9:00AM EDT (13:00 UTC) - 12:00PM EDT (16:00 UTC)
Blighted Blastbones randomly failing
As you can see from the pic, Blastbones is blacked out an unable to execute standing right in front of the trial dummy. This happens frequently during a parse. Usually bar swapping will fix it. Sometimes not.