In your main file you need to uncomment the 'define use_lowpriority' and rearrange the DT-INTS setup section.

Try:
Code:
   ' ---------- Set up DT_INTS-18 Routine for Instant Interrupt handling   -----------
   DEFINE USE_LOWPRIORITY  1   ' Include if using Low Pr. PBP INTS
 
   ' ****** include Placed here becuase of pin varables and routine varable needed to be set first  *******  
   INCLUDE "DT_INTS-18_Q43.bas"                  ; Base Interrupt System for 18FxxQ43 processors  ( DT_INTS-18_3_42.BAS)
   INCLUDE "ReEnterPBP-18.bas"                   ; Include if using PBP interrupts
   INCLUDE "ReEnterPBP-18LP.bas"                 ; Include if using Low Priority PBP INTS
 '------------------------------------------------------------------------------

  INCLUDE "modedefs.bas"                        ' Required for shiftout,shiftin commands as defined symbols

 ;----[High Priority Interrupts]-----------------------------------------------
ASM
INT_LIST macro	; IntSource,         Label, Type, ResetFlag?
   INT_Handler TMR1_INT, _EL_ClockCount,PBP,yes      ; Call ClockCount  subroutine in K9_Elapsed_INT-18.bas
;   INT_Handler TMR3_INT, _Show_Display, PBP,yes      ; Call Display Show for LED Modules in   
;   INT_Handler TMR2_INT, _Bright_Ctrl,  PBP,yes      ; call Brightness Control for display module 
 endm
 INT_CREATE				; Creates the High Priority interrupt processor
 
;----[Low Priority Interrupts]------------------------------------------------
INT_LIST_L  macro  ; IntSource,        Label,  Type, ResetFlag?
   INT_Handler TMR0_INT, _Timer0_Count, PBP,yes      ; call Timer0_Count subroutine
;   INT_Handler  IOC_INT, _Rx_mode_IOC,  PBP,yes      ; Call Rx_mode_IOC subroutine for RF RX_mode
;   INT_Handler  U2_INT,  _Term_RX,      PBP,yes      ; Q43 - Call Term_input for terminal char buffer  
  ; INT_Handler  RX2_INT, _Term_RX,      PBP,yes      ; K40 - Call Term_input for terminal char buffer  
 endm
 INT_CREATE_L                            ; Creates the Low Priority interrupt processor
ENDASM