[PD] any reason that MTC crashes Pd on OS X?

[jurgen]

Sending MTC to Pd and reading it with [midiin] makes Pd unresponsive - using [print] continues listing incoming data even when the MTC generator is stopped. This occurs both when I use IAC and external MIDI in. The data received seems to be correct, I follow the documentation for Max.
There is no obvious reason why this should happen and I wonder if anybody was able to receive MTC and actually use it. 

Jurgen