I have fixed this in the following way:

* build the python-mb package for Python 2.4 and 2.5 only, and not for 2.6
* changing the hash-bang line in the mirrorprobe and mirrordoctor script to #!/usr/bin/python2.5

See http://www.debian.org/doc/packaging-manuals/python-policy

A fixed package should become available in the build system later today at 
http://download.opensuse.org/repositories/Apache:/MirrorBrain/