For those interested in communicating between Matlab and pd using OSC, the following link should be very useful:

http://stackoverflow.com/questions/17077364/communicating-between-pure-data-and-matlab-using-osc

The weird problem the original poster describes seems rather specific to their system, but about 1/3 of the way down there is an answer with a wealth of good material including Matlab/pd client/server examples, links to the sources for osc-mex, compiled 32- and 64-bit Windows mex files, and compilation instructions.