Dear skimask,
Thanks for your time and the suggestions.
Let me reorganize and see. Also I will clear the TMR0 approp.
However, I wonder how come the interrupt routines without the blink button works absolutely alright on the PIC.
And when I removed the whole button routines and rewrote the code to accept the variable 'spacing' from PORTA through a DIP switch, the code worked without hitch on the PIC.

Divaer