AVR-Chat

Hi Folks,

I've run into a problem that has me pulling out my hair.  I'm using
the AVR Dragon and the latest version of AVR Studio to debug my
boards.  I have two versions let's all them Ver1 and Ver2.  The only
difference being the RF matching network.  Ver1 works fine.  If I use
the exact same firmware that works in Ver1 in Ver2 it will hang at a
spot that makes no sense.  

After working for quite a while, I discovered the offending code as
"PORTB.0 = 1;".  All I am doing is setting the PORTB.0 pin high but as
I single step through the code it will hang right here. So, the code
snippet looks like:

PORTD.7 = 1;  <-- this works
PORTB.0 = 1;  <-- hangs here

If I reverse the two lines to this: 

PORTB.0 = 1;  <-- now this works 
PORTD.7 = 1;  <-- debugger hangs here


This strange behavior doesn't occur with the Ver1 board, only with
Ver2.  I've checked (multiple times) to make sure that there are no
shorts.  I've checked the bare boards and everything looks good.

Does anybody have any ideas what I should try next?

Thanks,

Richard Cooke
Lake Forest, CA USA