Sorry for the double post but this may be of interest here:
I've found a simple solution to all these repeater/extender problems with Flirc, so I thought I would post here. I also tried a bunch of different extenders because my media Mac is located behind a cabinet with one HDMI cable going to the TV. None of them worked reliably. Had to be a certain distance and point the remote dead center at the sensor- not practical. Tried learning with and without the extender. If the extender was out of the loop, Flirc worked great every time.
I found these IR over HDMI kits and they all work without any delay, from any angle, and from across the room. Very reliable.
This one can send to multiple emitters and includes a more convenient front facing IR sensor:
Hope this helps some folks.