The following is a list of known bugs with SETools. * If you are using Python 3.5 and see errors like this: SystemError: returned a result with an error set This is a bug in the wrapper generated by SWIG. This has been seen on SWIG versions 2.0.12 and 3.0.7. Upgrading to SWIG 3.0.8+ and rebuilding SETools should address this issue. * A bug in NetworkX 1.8+ will output the following message to stderr if a type is valid, but not a node in a domain transition or information flow graph: 'Type' object is not iterable This message may be seen multiple times at the end of running unit tests.