oric_dan(333):
Atmel does not seen to have ever claimed it's a chip internal problem, but rather they speculate that it's most likely a problem that may be caused by noise coupling from the chips clock lines pin(S) to the RX0 pin, so circuit layout external to the chip may be a variable that increases or decreases the possibility of one having the problem,
That seems to be a new piece of information, unless I missed it in the jumble.
It was a passing comment by one (or a couple of) avrfreaks poster that apparently sought out ATMEL's help, he was told effectively to clean up his circuit layout. That coupled with the fact that the problem is never mentioned in the errata section of any published Atmel datasheet for the 1284P lends credence to that 'speculation'.
Lefty