The BioUnit.take seems to be confused by a hybrid PDB file save from Chimera:
>>> x.report()
Traceback (most recent call last):
File \"<stdin>\", line 1, in <module>
File \"/home/raik/data/py/Biskit/PDBModel.py\", line 360, in report
m = self.takeChains( [c] )
File \"/home/raik/data/py/Biskit/PDBModel.py\", line 2434, in...
2012-05-11 07:43:51 PDT in BisKit