Hello Chris,
I would expect that this is because of a version difference in your two machines. What OS are they? What version of VISA are they using? You can see the VISA version in MAX under the software folder. Also, to clarify, are you speaking about the "VISA Options" tab that appears when you select NI-VISA from the software folder, or something else?
If you need to download a newer version of VISA, see here for all VISA versions:
http://digital.ni.com/softlib.nsf/webcategories/85256410006C055586256BAC002C51FA?opendocument&node=132070_US
Hope this helps.
Scott B.
Applications Engineer
National Instruments