I report a bug experienced on both PD version 47 and 48 for mac OsX Sierra 10.12.6.
I cannot change the block size differently from 64 and 128.
Basically if I change to a value bigger than 128 it gets stuck and I have to kill PD.

Any suggestion? Not sure if it is a bug of PD of the bad handling of audio in latest macbook pro...

Thanks in advance