I have built new Mac QCN clients and drivers to fix the problem with the new 'Lion' OS X upgrade and the JoyWarrior. Download and install the new driver from http://qcn.stanford.edu/download/qcnusb-mac.zip . Then click 'Reset' in BOINC Manager to get the new version. The problem is in the Mac 64-bit 'human interface' (HID ie joystick etc) library - so the Mac versions are now for 32-bit PPC and Intel.
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