Gw INSTEK AFG-2005 not visible on MAX

I am trying to talk to a Gw INSTEK AFG-2005.

I downloaded and installed the driver and labview code from

http://www.gwinstek.com/en-global/products/Signal_Sources/Arbitrary_Function_Generators/AFG-2100_AFG-2000

The device is not visible in max although it is visible in windows device manager.

The labview code from gwinstek is not working for me (COM4).

(-1073807202 VISA Open in GW AFG2000 Initialize.vi)

I can talk to the device via teraterm but using exactly the same settings (teraterm close etc) I cannot even configure the serial port without it failing as follows:

code: -1073807202

source : Property Node (arg 1) in VISA Configure Serial Port (Instr).vi->talk to arb.vi

Any ideas why teraterm is working and labview is failing?