Can't connect to keithley source meter through Agilent GPIB/USB interface Even though the interface shows up in MAX

Hi all,

I am trying to use labview to control a keithley 2450 source meter. I have the source meter connected to my computer through an Agilent 82357b usb/gpib interface.

The source meter shows up in MAX as My System -> Devices and Interfaces -> "GPIB1::18::INSTR". It also shows up in MAX  as

My System -> Devices and Interfaces -> Miscellaneous VISA Resources -> "GPIB1::INTFC" and "GPIB1::18::INSTR".

I can connect to the source meter using MAX's "visa interactive control". the visa resource "GPIB1::18::INSTR" also shows up in labview.

But when I try to run my labview program it is unable to connect to the instrument.

Any Ideas?

Thanks,

Also. Why does my GPIB/USB interface show up as a miscellaneous visa resource?