Many issues with Cura 14.01 and self built printer

[sim0cyz 0]

Hello, I have a self built printer with sanguinololu 1.3b board and marlin firmware. I am having some problems with Cura:

the software itself works great, heats up my hotend/heated bed, moves my motors. The GCode it makes me export works great in Pronterface, but I'd love to print from Cura.

One of my troubles is bed leveling wizard: it moves the hotend in 4 different points, but when I try to print the line around the bed to check if it's level, it only heat my printer and, when ready, move a little the motors and give successful message. (without print nothing)

The main question is: why, when I try to print from Cura, it prepares my printer and, when ready, progress bar is going on but printer is doing nothing?

In "Term" tab, I get a series of:

"Error:Line Number is not Last Line Number+1"

thank you in advance