Hi, I wanted to see whether latest upstream 2.7.0 might fix this bug, but I learned that it needs packaging of mda-xdrlib[1] first. I gave up at this point but I pushed branch 2.7.0 to Git where you might cherry-pick from once you might want to upgrade.
Hope this helps at least a bit Andreas. [1] https://github.com/MDAnalysis/mda-xdrlib -- http://fam-tille.de