If you have access to a hardware programmer you might wish to load your application without a bootloader (erase chip first), that would quickly isolate if the bootloader is twitching the I/O bits or not.
Lefty
If you have access to a hardware programmer you might wish to load your application without a bootloader (erase chip first), that would quickly isolate if the bootloader is twitching the I/O bits or not.
Lefty