Ahh - I'm not terribly familiar with Python classes, so that was a guess... but it sounds like this would work then:

call = ':'.join(vssFolder<font face="Courier New">.replace("/",":")</font>,
self.pyfileFmt % (i+1))<br></br>

...in place of the original line:

call = os.path.join(vssFolder, self.pyfileFmt %
(i+1))<br></br>

...I hadn't looked at that code, but I think BB was trying to account for the folder being in various places on some user's system, so the path is built up into that vssFolder variable.

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