Many thanks for your prompt response!
Windows 7, Unity 4.1.5f1
I've upgraded to the most recent version just now (4.2.1f4), and that appears to have fixed the problem. Many thanks!
I can verify I'm having the same issue. I have tried completely removing shader forge and re-adding it to unity, and also tried restarting unity, but no luck.
Fantastic! Many thanks
Customer support service by UserEcho