What version of VI Logger do you have? If you don't have the 1.0.1 upgrade installed, I would suggest to install that. There were a lot of issues with VI Logger 1.0.
Also, can you plot anything from the 1102b with VI Logger? In other words, can you plot a voltage virtual channel? I'm just curious if the issue is specific to thermocouple channels or the 1102b.
VI Logger 1.0.1
ftp://ftp.ni.com/support/vilogger/upgrades/1.0.1/
Regards,
Todd D.