running rancid manually works, but not via do-diffs

[Rizzo, Joe]

I am setting up RANCID on a new system.  When do-diffs is ran a device
does not get polled.  The error in the log is:
vpwan01_eatx clogin error: Error: Connection closed (ssh): vpwan01_eatx
vpwan01_eatx: missed cmd(s): show env all,show module,show
controllers,show diagbus,show diag,dir /all disk1:,show gsr ch
assis,dir /all bootflash:,write term,dir /all disk2:,show vtp status,dir
/all sup-bootflash:,dir /all slot2:,dir /all slo
t0:,dir /all sup-microcode:,dir /all disk0:,show install active,show
bootvar,show vlan,show controllers cbus,dir /all nvr
am:,show flash,show version,show variables boot,show c7200,show boot,dir
/all slot1:
vpwan01_eatx: End of run not found

However rancid -d vpwan01_eatx produces no errors and generates healthy
looking .raw and .new files.

Why would clogin/rancid work manually but not when do-diffs calls
rancid/clogin?

Any ideas?

Thanks,
Joe