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I can't connect via the latest Repetier. I get a connection open but no firmware messages.

On Mac 10.8.2, Arduino 1.04, Repetier 0.56 (53), using tty modem to connect. I have firmware already configured with the latest settings except for the baud rate. It was set to 56K.

I suspected it is baudrate so I uncommented the baud rate to use 115,200 in Arduino (one place, right?) and uploaded to Rostock.

I turned off the printer, turned it back on.

If I go into config on the LCD, baudrate is still 250K.

Repetier printer settings are correct: 115,200.

Any ideas? Do I need the FTDI virtual port? And if so, a stupid question, is my macbook pro (intel core duo) x64 or x86? (I should know this but can't figure that one out..)

Baud rate is in the EEPROM in repetier, so changing it in the firmware won't make any difference.
Just set it to 250K in the printer configuration menu of repetier host.
You'll almost certainly get less errors at 250K than 115200, becasue the former is an exact division of the chips clock and the latter isn't, so there is less jitter in the signal.

That did it! I was trying to be smart. See what that gets me?