Keithley usb-gpib problems

Hi
I have installed a Keithley USB-GPIB switch (CE 488) and suddenly my executable does not run properly, gets stuck and throws data that is not true.
The NI-MAX shows an unknown VISA entity.
If I am using VISA/GPIB write/read sub.vi in my program will it influence the proper running of my executable?

Hi (my prior name was Dect&Bluetooth),
I have run on third party connectivity software (Intuilink from Agilent and CMD2Go from Rohde&Schwarz) on the Keithley Usb-Switch and it worked.
My program still makes problems as described before, maybe due to the fact that I am using a NI VISA READ/WRITE in some cases?
I have added a Spy file to show you the fails, I have changed the suffix to txt, you have to change it back to .spy in order to be able to read it.
Does it mean that I cannot use SCPI commands with NI VISA in order to use this adptor?
Thanks for any help.
Yariv
Attachments:
CaptureKeithleySwitch2.txt ‏2619 KB

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