I am using FTDI FT232R to comunicate via RS485 with Dynamixel Robotis servo (in particular EX106).
My program is written in C++ using visual C++ 2010 and I am using the last driver from FTDI (version
I am using Windows7 (64 bit) and I am testing my program on many machine. On some machine it works and on others it doesn't. If I launch my program using "run as administrator" under Windows 7, the program doesn't work on any PCs.
In fact the error which FTDI library returns is


It seems that using "run as administrator" prevents the communication with FTDI chip
Is anyone could kindly help me?