Hello Ian,
From what I understand, this problem occurs because of the fact that DSC loads some DLLs dynamically in some of its VIs. Since they are loaded dynamically (instead of having concrete search paths), it takes LabVIEW a while to find them...if it takes too long, you will receive the error you mentioned.
From what I understand, this problem does not occur in the 6.1 version of the DSC module. If you are still using 6.0.2, the simplest workaround for now is to use the File >> Open option in LabVIEW instead of double-clicking on the LLB.
I hope this suggestion helps. Good luck with your application.
Sincerely,
Darren N.