Is your reaction exothermic? I have found out that if the nitromethane reduction isnt exothermic, the reaction actually failed.
You need to basify just enough to make the pH about 10. Too much pH and you destroy the molecule.
Next time you do an A/B procedure, slowly....i mean slowly basify one drop at a time with good stirring. this will first make a cloud then when the oil falls out, let it settle for a few hours. Then extract with DCM 3x, combine extracts, distill off DCM, and weigh out the crude base. Then you should distill if your yields are high enough. If you collected very little after a failed reduction, then check your MDP2P, most likely you didnt create real MDP2P.
Good luck~