PIC32MX795 only operates with PICkit 3

/*
 * File:   main.c
 *
 * Purpose: To blink an LED, Test Timers, and interrupts
 */

// DEVCFG3
// USERID = No Setting
#pragma config FSRSSEL = PRIORITY_7     // SRS Select (SRS Priority 7)
#pragma config FMIIEN = OFF             // Ethernet RMII/MII Enable (RMII Enabled)
#pragma config FETHIO = OFF             // Ethernet I/O Pin Select (Alternate Ethernet I/O)
#pragma config FCANIO = OFF             // CAN I/O Pin Select (Alternate CAN I/O)
#pragma config FUSBIDIO = OFF           // USB USID Selection (Controlled by the USB Module)
#pragma config FVBUSONIO = OFF          // USB VBUS ON Selection (Controlled by Port Function)

// DEVCFG2
// External Oscillator uses base 20MHz oscillator
#pragma config FPLLIDIV = DIV_5         // PLL Input Divider (4x Divider) Using 20MHz/5 = 4MHz
#pragma config FPLLMUL = MUL_20         // PLL Multiplier (20x Multiplier) 4MHz * 20 = 80Mhz
#pragma config UPLLIDIV = DIV_5         // USB PLL Input Divider (5x Divider) (USB module must have an input of 4MHz to multiply by 24 (96) and divide by 2 to get 48MHz for FS)
#pragma config UPLLEN = ON              // USB PLL Enable (Disabled and Bypassed)
#pragma config FPLLODIV = DIV_1         // System PLL Output Clock Divider (PLL Divide by 1) => 80Mhz/1 => 80MHz

// DEVCFG1
#pragma config FNOSC = PRIPLL           // Oscillator Selection Bits (Primary Osc w/PLL (XT+,HS+,EC+PLL))
#pragma config FSOSCEN = OFF            // Secondary Oscillator Enable (Disabled)
#pragma config IESO = OFF                // Internal/External Switch Over (Disabled)
#pragma config POSCMOD = XT             // Primary Oscillator Configuration (HS osc mode)
#pragma config OSCIOFNC = OFF           // CLKO Output Signal Active on the OSCO Pin (Disabled)
#pragma config FPBDIV = DIV_1           // Peripheral Clock Divisor (Pb_Clk is Sys_Clk/1)
#pragma config FCKSM = CSDCMD           // Clock Switching and Monitor Selection (Clock Switch Disable, FSCM Disabled)
#pragma config WDTPS = PS1              // Watchdog Timer Postscaler (1:1)
#pragma config FWDTEN = OFF              // Watchdog Timer Enable (WDT Enabled)

// DEVCFG0
#pragma config DEBUG = OFF              // Background Debugger Enable (Debugger is disabled)
#pragma config ICESEL = ICS_PGx1        // ICE/ICD Comm Channel Select (ICE EMUC1/EMUD1 pins shared with PGC1/PGD1)
#pragma config PWP = OFF                // Program Flash Write Protect (Disable)
#pragma config BWP = OFF                // Boot Flash Write Protect bit (Protection Disabled)
#pragma config CP = OFF                 // Code Protect (Protection Disabled)

#include <p32xxxx.h>
#include <plib.h>
#include "delays.h" // must create own delays

#define LED1 LATBbits.LATB12

//	Function Prototypes

// Note: In order to test code running via the pickit3 you must go to "Run" => "Set Project Configuration" => "Customisze..."
//                                                                     => Select pickit3, then on side menu select pickit3
//                                                                     => select "Power" from drop down menu at the top
//                                                                     => check in "Power targe from circuit" and the voltage default is 3.25V, which is fine

int main(void) {

    SYSTEMConfigPerformance(80000000); // predefined function from plib.h that optimizes access time to flash memory, enables the instruction
                                       // and data caches, and enables the PIC32 cache module to jump ahead and read functions that aren?t being
                                       // executed yet so there is often zero wait time for accessing those instructions

    DDPCONbits.JTAGEN = 0;  // disable the JTAG port

    TRISBbits.TRISB12=0; // 0= ouput 1= input
    AD1PCFG=0xFFFF; // pg. 144 of PIC32MX250F128B datasheet

    LED1=0;

    while (1)
    {
        LED1=~LED1;
        delay_ms(1000); // 1000ms delay 1s delay
    }

    return 1;
}