Adding references from network path causes 'Automation' error

[ben h]

I think it's the UNC path that's the problem, at any rate it's a mapped
network drive. I saved my stencil (with macros) and template to the same dir
on the network drive, then tried (both programmatically and manually) to add
a ref to the stencil's VBProject from the template. No go, Automation error.
Saved them both to a local drive, no problems.

Any ideas why??