Ok, I am using RC12.
Using a Windows 7 Pro 32 bit computer, I did a complete format, removed the device, restarted the program, forced a firmware upgrade.
Unplugged the flirc again, closed the program and restarted it.
Inserted the Flirc again, and proceeded to program as normal, selecting the noise canceller as suggested. There are no other IR sources in the room except the TV and that receives, but does not broadcast.
It appeared to work, but when I inserted the Flirc into a USB port on the mother board, no extension cables, no usb hubs, i still had repeated and random scrolling.
I am using a Vizio XRT010 remote, a Gigabyte Brix PC, using an Intel USB 2.0 port.
The OS of this computer is Windows 7 Professional SP1 x64, running XBMC Gotham 13.2.
I have attached my config from the Flirc.
What else might help you to troubleshoot?
my_flirc_config.fcfg