Program fails crossing code page

[Art]

No Branch statements, in fact I don't remember ever using it.

ISR looks like this (should look very familiar to you, except I handled RB0 interrupt myself):

' ------[ This is the Interrupt Handler ]---------------------------------------
ClockCount:   ' Note: this is being handled as an ASM interrupt
@ INT_START                    
'
  R0save = R0                     ; Save 2 PBP system vars that are used during
  R1save = R1                     ; the interrupt
'
IF INTCON.1 = 1 THEN        'handle portb.0 interrupt
INTCON.1 = 0            'clear portb.0 interrupt flag
@ incf _extint,f        'increment external interrupt counter
goto overextint            'skip over timer interrupt handler
ENDIF                '
'
'
@ RELOAD_TIMER                    ; Reload TIMER1
@ incf _Ticks,f
    if Ticks = 100 then
@ clrf _Ticks
@ incf _Seconds,f
       SecondsChanged = 1
       if Seconds = 60 then
@ clrf _Seconds
@ incf _Minutes,f
       endif
       if Minutes = 60 then
@ clrf _Minutes
@ incf _Hours,f
       endif
       if Hours = 100 then
@ clrf _Hours
       endif
    endif
'
overextint:
'
  R1 = R1save                     ; Restore the PBP system vars
  R0 = R0save
@ INT_RETURN                      ; Restore context and return from interrupt

'-----====[ END OF TMR1 Interrupt Handler ]====---------------------------------

variable blabla = 0
was asmed to clrf statements because the last time I checked,
PBP zeros variables by copying a zero value to the variable like any other value,
wasting one instruction per "variable = 0" statement.

Shouldn't thew ISR always be at 0x04 vector? shouldn't be a problem accessing PBP vars in asm there.