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I think we’re looking at September or October for 3.2. The Baker lab devotes a lot of resources to CASP. We discussed this a few weeks ago and there wasn’t much developer interest in an April release before CASP.
The DataCache is basically a “bag of holding” used to pass pose-related stuff around the code attached to a pose. Probably the Membrane score function is expecting certain data objects inside (probably scoring-related neighbor graphs which tell it what residues to score how), but nothing is actually setting the data up, thus the crash. You may be able to find the code that sets it up in the membrane_abinitio code and patch it into relax.
You also could consider trying the membrane abinitio/relax mode with fragments drawn from your pre-existing known structure?