patrick - 2013-05-04

I finally found the reason for my problems described above. On the occasion of my tests, I installed the driver FTDIUSBSerialDriver (http://www.ftdichip.com/Drivers/VCP.htm) on my macbook
It is this driver that prevented normal operation of QLCplus. Since I retired QLC works perfectly.
More explanations here:
https://sourceforge.net/p/qlcplus/discussion/general/thread/0d5a4527/#17a9