Comment 4 for bug 1460422

Thanks for the new features!

> I was not able to reproduce the failure with custom position option - any details you could share?

It seems that Python 2.6 doesn't support the string format syntax you used. Adding a positional argument (replacing '{}%' with '{0}%' line 238) fixes the issue for Windows XP and the official 32 bit devlibs, and should not cause problems with Python 2.7 and 3.1+ (see https://docs.python.org/dev/library/string.html#format-string-syntax).