Do the lights on your IR board light up properly when you press a button on your remote? (and do they turn off when you're not pressing a button?) It's possible the PIC on your IR board could have been corrupted- see
Team Update 10 for info on how to fix that. We had a similar problem on Saturday, and that was the cause.
Also, try checking the wiring of your IR board with an oscilloscope to make sure your RC is receiving the correct signal. You should get a 5V square wave on each output from the IR board if it's working right. When you think is right, but you still can't get it to work, it's always a good idea to make sure your sensors are fully functional in the first place.