I am having a lot of trouble communnicating with my ACM Quad. Since I switched over to ACM, I can't communicate with it. I keep getting bad packet or readpacket read errors in mavlink. The XBEE doesn't work at all but the USB occasionally works. I rechecked all connections and am getting 4.95V on my power from the power board. I reloaded all drivers (labview, USB, etc., and tried reloading the firmware (several times). I switched my receiver from AR6100 to AR7010 (spektrum) and back. On the rare occasion I get the motors from beeping at 4 CPS (my other problem), I can't arm them. I tried manually setting the ESCs to no avail. Every now and then, I'll get a readout from the sensor display in mavlink but then it locks up and I have to restart it (mavlink). When I ran the motor test one time I thought things were looking good, motors 0 and 1 (front right and back left - x config) don't spin up, even though they do when I manually set ESC. I'm getting the fast flash blue for receiver and the GPS eventually goes solid. I've tried reseting the ARM as I open communications too. Please, any advice would be greatly appreciated.