Hi Nick,
Here are a couple more things to try:
1) Open LabVIEW and go to Tools->Find VIs on Disk. Search for the "Merge Errors.vi". If you find any instances of the VI that are not in LabVIEW 7.1\vi.lib\Utility\error.llb, remove them.
2) Make sure the TestStand LabVIEW support files are mass compiled for LabVIEW 7.1 (by default they are compiled for LabVIEW 7.0). These files are located in Program Files\National Instruments\TestStand\AdapterSupport\Labview\LoadTarget.llb.
3) In LabVIEW, switch your execution target to your RT target and go to Tools->RT Target:
Options. Under VI Server:Configuration, make sure TCP/IP, Allow VI Calls, Allow VI methods and properties, and Allow application methods and properties are a
ll checked and that the Port is 3363. Under VI Server:TCP/IP Access, make sure your computer (not the RT target) is in the TCP/IP access list. You can just add "*" to test it out. The defaults for the other option categories should work.
Hope this helps,
Drew Creel
Software Engineer - Signal Generators
National Instruments
Drew Creel
NI Software Group Manager
RF and Signal Generators