[PD] pd running fine, then unexpectedly freezing on ubuntu

[hard off]

i just installed pd-extended in ubuntu studio, and played around with the
jack settings so as to avoid A/D/A errors..and it seemed to be working ok.


but then all of a sudden, after 10 or 15 minutes, pd will just freeze.  this
happened about 5 or 6 times today, so it wasn't a one off.

what's more, after it freezes, if i force pd to quit, and try to open it
again, the pd console comes up, but all the menus are blank and nothing
works, so i have to restart the entire computer to make pd work again.

the pd console is giving me SIMD messages, which i never saw before on os
X...  could that be somehow related to what is happening?
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