I'm writing a GUI with OscP5 providing OSC functionality and been having severe system hangs (hard reboot needed). I thought it was bad programming somewhere, but  it turns out it was the 'Trusteer Endpoint Protection' application  installed by an online banking site. The associated 'Rapport Management Service' was hogging CPU as it tried to sniff out network activity and resulted in the whole system (Win 7) hanging (nice work there, Trusteer). Uninstalling the app fixed the problem.

 

Hopefully this will prevent head-scratching for others...

 

L.