Emu XL-7 & MP-7 User's Group

Last week I bought MP7, plugged it in and tried to send sysex data 
into cubase and cakewalk, but none worked.  i have another EMU module 
and it works just fine.  After calling tech support, I was told to 
exchange it for another unit, so i did.  The same problem exists for 
the new unit.  Does anyone have an idea on what's wrong?  Any known 
problems for midi ports or sysex?  In the meantime I will try 
exchanging again for another unit.  gracias for any replies...