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[Update: everything is working. Move along now, nothing to see here!]
The servers that supply the arrival times, route names and stop names are not working right now. I have emailed TriMet about it, but it is a Sunday.
The trip planner does appear to be working - so you can use that to get your arrival times, or call 503-238-RIDE.
(This picture is from the simulator - there is an extra line there for the Streercar servers which do appear to be working).