BTW default settings for devices can be found in the relevant *.pbpinc file (in this case PIC16F628A.PBPINC) and the watchdog is indeed enabled by default. If you turn it off do you see a different HEX image from the pre-compiled one?

It will be more sensitive with out the diodes (I quess they are for protection - but what do I know). Thinking aloud - If you double the number that the adc returns does that double the sensitivity? not if its a log scale! Post some code when you get it working the way you want it.

George