Do I have a crystal ball? Actually yes, there's one next to my monitor, but when I look in it I can see all kinds of things but unfortunately your program isn't one of them!

If you are blinking a LED on PortB, you got no worries...

If you are using any pin that is shared with a Comparator, then just like the Datasheet says... it's not going to work without adding code to disable those comparators first.