Thank IOHannes for pointing me to valgrind. From a preliminary test I didn't see any memory leaks with Memcheck. I used the command line: valgrind ‹leak-check=yes pd-extended myPatch.pd Valgrind only returned "Conditional jump or move depends on uninitialised value(s)" for various processes in the Mac OS and Pd I also tried Memcheck on my own code using a dummy program and get no leaks.
Maybe I'm not using valgrind correctly to test a .pd file?

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256

On 2014-02-26 23:22, Robert Esler wrote:

The strange behavior is as follows:

this all looks like memory corruption.

run your patch through valgrind and see what it gives youl.

fgasdmr IOhannes -----BEGIN PGP SIGNATURE-----