The bug might be in the RXTX library?
Some serial drivers also don't support 14400 and 28800, particularly the cdc_acm driver on Linux.
Glad you're enjoying the compile speedup. 
I also recently fixed the bugs in error reporting to multi-tab projects, but it looks it might have been too late to make the 1.0.1 release....
What I get from all of this is: It Is What It Is.
However that does not help me, I am trying to communicate with a servo unit that only knows 14400 baud.
What I am seeing on the output of uno and or mega uart is different width pulses for each bit. and the servo's
uart just does not like that. I added an external uart from SparkFun and it's output is as 'steady as a rock', solving my
problem talking to the servo.
Thanks everyone for all the information.