Thanks for the hint, adp001. I've got it working on my Mac now.

I replaced one line about halfway through the vssui.py script, near the end of "class Wacros(object)":-

this is the old line (commented out):

#call = os.path.join(vssFolder, self.pyfileFmt % (i+1))

this is the replacement:
 

call = ':'.join((':Runtime:Python:vss', self.pyfileFmt % (i+1)))

This uses a literal string for the vss folder. The folder variable vssFolder is no good here because it uses the os path separator ("/" in the case of Mac/Linux/Unix).

I don't know if this is a solution to the problem, or just something that works for Me'n'MyMac.
Hopefully it will help...

Izi

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)