[LAU] zynaddsubfx crashes when loading a new bank

Everytime I want to change an instrument/ bank in zynsubaddfx (beginner mode), it crashes... $ zynaddsubfx ZynAddSubFX - Copyright (c) 2002-2005 Nasca Octavian Paul Compiled: Dec 18 2007 21:09:57 This program is free software (GNU GPL v.2) and it comes with ABSOLUTELY NO WARRANTY. Try 'zynaddsubfx --help' for command-line options. Sound Buffer Size = 256 samples Internal latency = 5.8 ms ADsynth Oscil.Size = 512 samples Internal SampleRate = 44100 Jack Output SampleRate= 44100 cannot complete execution of the processing graph (Resource temporarily unavailable) zombified - calling shutdown handler