I can confirm this on my two boards. One is an original Arduino, the "bad" design with the chip near the power connector - this one has Rx problems at 250000 but not 115200 (or it's very rare). Other one is SainSmart, the "good" design with the chip between the headers, and it doesn't have any problems with the serial. The SainSmart however has some problems with resetting on power on or after programming, and needs pushing of the reset button.
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