I'm using Classic too, and the deploy did not return any errors (once I enables IIS on my machine).
It is a simple "hello world" test. The service has one function TestFunc which accepts a string param and returns a string that adds "You passed " + as_passed
I'm going to try another machine. I've got PB 11.5 on an XP machine that I can try, or maybe I'll install 12.5 from scratch on a Win7 32 bit..