We have a replica set includes 3 members on 3 different host (primary/secondary/arbiter)
After update to the version 2.0.0 we miss some functionalities among other things
the most web stats pages show this error message:

Only "isMaster" shows correct information
And this on websites from all 3 members.
Also doesn't work call from mongostat, we get the same error message:

mongostat -v --host x.x.x.73:27017 -u muser -p mpassword
Fri Oct 7 10:19:00 creating new connection to:x.x.x.73:27017
Fri Oct 7 10:19:00 BackgroundJob starting: ConnectBG
Fri Oct 7 10:19:00 connected connection!
connected to: x.x.x.73:27017
error: