QNX with SMP kernel is unstable

QNX with SMP kernel is unstable. For example, QNX hangs during QNX Momentics IDE 4.0.1 start: mouse and keyboard are 
frozen. It works normally with uniprocessor kernel (with/without DMA).
Configuration (pidin/qconfig):
CPU:X86 Release:6.3.2  FreeMem:813Mb/990Mb BootTime:Mar 10 04:52:37 MSK 2008 
Processor1: 263730 AMD ?86 F15M11S2 2213MHz FPU 
Processor2: 263730 AMD ?86 F15M11S2 2213MHz FPU 
QNX Installations 

  Installation Name: QNX Momentics Development Suite 6.3.2
            Version: 6.3.2 x86-only
     Base Directory: /usr/qnx632/
           QNX_HOST: /usr/qnx632/host/qnx6/x86/
         QNX_TARGET: /usr/qnx632/target/qnx6/

Any ideas (except to work with uniprocessor kernel :-) ?
Is there anybody here who normally works with SMP kernel and at least two processors?
Thanks,
Vladimir