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bad structure declaration?

i'm trying to create an array of structures but when i make more than a handful my robot doesn't work.

so in main.h i have

typedef struct SPid
{
  int dState;      	 // Last position input
  int iState;      	 // Integrator state
  int iMax, iMin;    // Maximum and minimum allowable integrator state
  int desired_value; // the desired value the PID should converge upon


  float 	iGain,    	// integral gain
        	pGain,    	// proportional gain
         	dGain;     	// derivative gain
}SPid;

extern SPid vel_Gains[];

and then in main.c
#include "MAIN.H"
struct SPid vel_Gains[5];

it barely works for vel_Gains[2], (printf looks glitchy but readable) and then vel_Gains[1] works for sure...

i'm using the small memory model btw...

is there a size limitation on global variables?

thanks,
fred

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