I'd suggest skipping the xbees first and just get your megas communicating to each other just using wires between the tx/rx/gnd pins. Once you have that working, then introduce the xbees to the setup. This should identify where the problem is.
I'd suggest skipping the xbees first and just get your megas communicating to each other just using wires between the tx/rx/gnd pins. Once you have that working, then introduce the xbees to the setup. This should identify where the problem is.