I have no issues on OS X 10.9 with the latest versions of Mobius and Bidule.
This is what I did:
- added sync transport
- added mobius and gave it some audio inputs and outputs
- I changed my track synchronization to:
Default sync source: Host
Default track sync unit: Loop
Midi sync unit: Bar
- changed sync to: bidule transport and pressed play on the transport
Works as expected without crash: when I press Record, Mobius waits for the start of the next bar.
Can you try from an empty document to see if these steps work for you?