For five years I've been shouting DATASHEET at people. In the end it all falls on deaf ears...

How the hell can you program for ANY device if you don't know and don't understand what's in the box? There are MAJOR differences between the A and non-A of this particular PIC. Oh and look... they just happen to affect PortA.3 as well...

If you can't be bothered to do that, take a different class in school, get another hobby, change your job etc...