Midi Machine Control

[Samson]

I just got a new console. A Soundcraft DC2000 with moving faders and digital control. It got an onboard computer that I sync to Cubase4 with midi. Automation is stored on the console.
I have managed to sync the console and Cubase. I can start and stop Cubase from the console, arm tracks for recording and when I press the rec button on the console, Cubase starts recording. Great fun!
But when I have had everything up and running and try to do it next day, nothing works. And I don't know what I'm doing wrong - or doing right when it works. I can start the console from cubase, but not cubase from the console. So it's a sync problem, but I don't know what it is.
Anyone got a solution for this?