1) Strange. I'm running the host for my cnc mill with zero extruder and didn't have that lock up. Maybe a sideeffect with a config setting I do not have. Do you have a screenshot of the second config page so I can test with these settings if I get a lock up. Also, when does th elockup occur. Directly at the start, after connect, ...
2) Sound more like a firmware configuration issue. If you are using Repetier-Firmware you should watch out for your heated bed setting. Default is
#define HEATED_BED_HEATER_PIN HEATER_1_PIN
the same as the second extruder. For Megatronics you need to change this to
#define HEATED_BED_HEATER_PIN HEATER_2_PIN
to use the heated bed output.
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