I tested here and have the same problem in Yosemite 10.10.5. 
Pd 0.47-0 32 and 64 bits with built-in input/output.

Em dom, 15 de mai de 2016 às 16:48, Jack <jack@rybn.org> escreveu:
In preferences, with "built-in" (CoreAudio ?) and "MOTU-ultralite MK3
hybrid".
++

Jack



Le 15/05/2016 21:40, IOhannes m zmölnig a écrit :
> On 05/15/2016 09:28 PM, Jack wrote:
>> Hello,
>>
>> I try to change the block size in preferences with Pd-0.47.0, but i am
>> unable to change 64 to 512 : Pd freeze.
>> Is it a bug or just a problem with my configuration ?
>
> while i don't know any answer, i'm pretty sure that it is important to
> know which audio backend you are actually using.
>
> gfmsa
> IOhannes
>
>
>
>
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