I find it's best to put a PAUSE 100 at the very top of the program (before anything) so that the ICD has something to latch onto before it goes wacko with interrupts.

Each of the include files disables debugging within that include by default.
But they also ENABLE it again at the end of each file.
Moving the first disable down to after the includes might help.
Code:
INCLUDE "DT_INTS-18.bas"     ; Base Interrupt System
INCLUDE "ReEnterPBP-18.bas"     ; Include if using PBP interrupts
INCLUDE "Elapsed_INT-18.bas"  ; Elapsed Timer Routines

Disable debug
ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
            INT_Handler    TMR1_INT,  _ClockCount,   PBP,  yes
              
        endm
        INT_CREATE               ; Creates the interrupt processor
    ENDASM
@ INT_ENABLE    TMR1_INT 
enable debug
You must also disable ALL code used by the interrupt handlers.

You can not debug the actual interrupt code because it could interrupt any debug information already being sent at the time the interrupt occurs.

Well, I should say that you CAN debug the interrupts, but only if the entire rest of the program is disabled. And the time it takes to communicate with the ICD makes it so you will miss many hundreds of interrupts in the process, so what you see may not be what you expect.
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