and Henrik is right
about this
USE a HSERIN/HSEROUT statement in your code - which you don't. Try adding a dummy

Code:
#CONFIG
  CONFIG  FOSC = INTIO67
  CONFIG  PLLCFG = OFF
  CONFIG  PRICLKEN = OFF
  CONFIG  FCMEN = OFF
  CONFIG  IESO = OFF
  CONFIG  PWRTEN = OFF
  CONFIG  BOREN = SBORDIS
  CONFIG  BORV = 190
  CONFIG  WDTEN = ON
  CONFIG  WDTPS = 32768
  CONFIG  CCP2MX = PORTC1
  CONFIG  PBADEN = OFF
  CONFIG  CCP3MX = PORTB5
  CONFIG  HFOFST = ON
  CONFIG  T3CMX = PORTC0
  CONFIG  P2BMX = PORTB5
  CONFIG  MCLRE = EXTMCLR
  CONFIG  STVREN = ON
  CONFIG  LVP = OFF
  CONFIG  XINST = OFF
  CONFIG  DEBUG = OFF
  CONFIG  CP0 = OFF
  CONFIG  CP1 = OFF
  CONFIG  CP2 = OFF
  CONFIG  CP3 = OFF
  CONFIG  CPB = OFF
  CONFIG  CPD = OFF
  CONFIG  WRT0 = OFF
  CONFIG  WRT1 = OFF
  CONFIG  WRT2 = OFF
  CONFIG  WRT3 = OFF
  CONFIG  WRTC = OFF
  CONFIG  WRTB = OFF
  CONFIG  WRTD = OFF
  CONFIG  EBTR0 = OFF
  CONFIG  EBTR1 = OFF
  CONFIG  EBTR2 = OFF
  CONFIG  EBTR3 = OFF
  CONFIG  EBTRB = OFF
#ENDCONFIG
  
  
        ;INCLUDE "modedefs.bas"
        ;INCLUDE"ALLDIGITAL.pbp"
        ;INCLUDE "HomeAutomationVars.bas"  'Open with PBP editor
        INCLUDE "DT_INTS-18.bas"     ; Base Interrupt System
        INCLUDE "ReEnterPBP-18.bas"     ; Include if using PBP interrupts

    define OSC 8
   
    DEFINE HSER_RCSTA 90h   'Hser receive status init
    DEFINE HSER_TXSTA 24h   'Hser transmit status init
    DEFINE HSER_BAUD 9600   'Hser baud rate
    DEFINE HSER_SPBRG 25
    DEFINE HSER_CLROERR 1
    
    DEFINE DEBUG_REG PORTB  
    DEFINE DEBUG_BIT 0
    DEFINE DEBUG_BAUD 9600 
    ' Set Debug mode: 0 = true, 1 = inverted
    DEFINE DEBUG_MODE 1
    x         var  word
    rxflag   var bit
    rxchar  var byte
ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
 INT_Handler    RX1_INT ,    _read_serial,   PBP,  yes
 endm
 INT_CREATE             ; Creates the interrupt processor
ENDASM    
OSCCON = $60   ;  OSC 8
@   INT_ENABLE   RX1_INT     ; enable external (RX) interrupts    
debug "running",13,10 
hserout "running",13,10     ;dummy
Main:
    debug "."    
    for x = 1 to 1000
      if rxflag then
         Debug 13,10,"got !! asc chr",#rxchar,13,10
         rxflag=0
      endif 
      pauseus 1000
    next x 
     
Goto main   
    
    
read_serial:
    rxflag = 1
    rxchar = rc1reg  
@   INT_RETURN