EPMP on pic24fj128da210
Ok, I get to answer this one myself.

Buried deep inside some example code lost somewhere in the MCP website I find this:


  Notes:
  
  
  Using arrays larger than 32K must be compiled with: -mlarge-arrays 
    This file is set to compile with this setting. Please refer to the C30 
    User's Manual for details on -mlarge-arrays (DS51284)
  
  ...
  


Now, you'd have thought that they'd have maybe mentioned that in the EPMP manual, now wouldn't you?