OK, so I did some more testing, and when I changed the path for our prototype from the network custom one we have, back to the standard that ships with C3D the error went away. Looks like I've narrowed it down to someting with that file in particular. If I can actually isolate and solve the problem Il post the result here for others. Thanks.
By chance do you have Parts List in your prototype drawing? If you do I have found that this is not a good idea. For some reason if you do a lot of custom parts C3D hates a parts list to be already in the drawing template.
Part of the reason I killed the pre defined networks and the parts list they link to. Helps your operators learn how to use them efficiently anyway.
Yes, our parts lists do live in the prototype. Never had an issue with previous releases...I wonder why it is a problem in 2014. I will try removing the parts list from the main prototype. So do you keep a separate pipe prototype then with the correct styles and parts?