Serial COM Error

Hello, I have a Prusa i3 and the last week it was printing very nice. But now, it doesn't work anymore. I noticed when it connected with Repetier (that's what I'm using), the motors locks itself, so i couldn't move the Axis manually. But now, when I push "connect", I can move the motors. I check in the log from Repetier and it says:

"No start signal detected: Forcing Start
Serial com errorystem.IO.Ports.SerialErrorReceivedEventArgs
Start"

I searched in Google about the problem, and the main cause is a baud problem. I check the baud of my port (COM 4) and it says 115200. I'm using a Sanguinololu 1.3a and I programming it in Arduino. I change the baud there and in the Repetier Host to 115200 and it doesn't works.
When I try to move the Z-Axis in the Repetier, it does very slow and doesn't move the indicate distance.

What happened here?

When changing baud rate in configuration.h you need to change EEPROM_MODE to copy it or it will still use the old baud rate.

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