MPC Software crashes when setting buffer size to 64 samples

Hello there,

My MPC Software keeps crashing constantly (i.e. hanging endlessly) when setting the buffer size to 64 samples, no matter which interface I use (Built-In, Renaissance, Focusrite VRM Box). It occasionally happens with 128 samples, too, but only when Soundflower is involved (input or output). Other buffer sizes don't produce any crashes. This happens in 32 and 64 bit mode.

I mostly only use internal plug-ins, except for the occasional software synth and some others, but it even crashes on empty projects.

After such a crash I need to turn off the MPC Studio and turn it on again, or MPC Software crashes while starting. This has happened before on ANY system, but that's another story. ;)

I am on OSX 10.9.2 with 16 GB RAM.

I couldn't reproduce this issue on my pre-Mavericks Mac (10.7.5), whereas I think the OS might be the problem.
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