I cannot detect a 4338B milliohmmeter by the Instrument Manager in VEE Pro, but the instrument can be detected using Agilent IO Control, the Agilent Libraries Suite are already updated. I'd really appreciate if someone can help with this issue!!
Do you have other VISA installed i.e. NI VISA? If you have other VISA installed, which VISA is primary?
If restarting VEE doesn't show the instrument, maybe can try to add the instrument manually and key in the VISA address shown in Agilent Connection Expert. After that, try Write/Read simple operation e.g. *IDN? see if it works.