snap not running with -t option of 1 or 2 on Mac OS X

[wm75]

It seems that the latest binary for Mac OS (SNAP 1.0beta.1) cannot work with -t set to 1 or 2 (tested with snap paired).
With -t 1, nothing happens - snap uses 0% cpu and remains idle indefinitely.
With -t 2, it opens the output file for writing and writes about 500 bytes (probably the file header, but I haven't actually checked that), then becomes idle as above.
-t >=3 works just fine.

I haven't checked any other OS to see whether the same problem exists or not.