Disclaimer: Other newbie trying to answer a question.

I think you need to enable the pull-up resistors for portb.  IIRC, the
internal pull-ups are disabled when you change PORTB to output.  Because you
have the LED bar tied to ground and the PIC can't source any current when
the output is high (if the pull-ups are disabled), the LED's will never
light up.  A simple test would be to turn the LED bar around and tie it to
VCC instead of GND.  You'll get the complement of what you're expecting.
Otherwise, you can add external pull up resistorts or set an OPTION bit (I
don't remember which) to enable the internal pullups.

Kevin

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