Unchanged progam does not compile today??

[Ioannis]

Many times the chip type on MCS does change on its own! Be careful on that.

Ioannis

[CuriousOne]

Say you have your code window opened, ant it is set for 18F45K80 chip.
You click on "new" code window, it opens, and by default it is set to 16F628.
Now if you just switch to your code for 18F chip, MCU type for it will also change to 16F628, causing compile errors.