Hi Pat,
You seem to have hit the nail on the head. When you open up LabVIEW with DSC, the Tag engine also starts, and tries to check the status of the tags, in the SCF file that was last loaded.
What I suggest you do is write a batch file with these lines
Pause 5000
c:\<path to VI>
This should give you a 5 second pause afterthe user logs in, to give the OPC server time to initialize and then it will open the VI.
Please can you give this a try and let me know how it goes.
Regards
JamesC
NIUK and Ireland