Thanks for the info, Dwanye.

Dwanye>>Make sure your MCLR pin is set as a input, not reset. .

Not sure what that means, being a newbie to microcontrollers and all. Does this mean I hook up this pin to +5V through a resistor?

Also, I'd eventually like to use 4 other pins for output to LEDs - do I need additional TRISIO commands for that?