The server is up and running OK Sebastian. Most likely you made a significant change to your Project prior to the last save. Is that possible?
How large is your aia source file? If the aia is larger than 5 Mb , your project will not compile and might not load. Do you have more than 10 screens; AI2 usually becomes unstable with more screens than 10.
Some times Please try again works. Just try again.
Do you have large sound or image files that load in the Screen1.Initialize event handler?
Did you save an aia file at any time? You might need the aia to recover your project.
Does this happen when you Projects>Save project as. ? and if that is what happens, how many copies of the project do you have? Sometimes users are unable to save more than about 10 copies of a project when they use Projects>Save Checkpoint and the issue you have might e similar.
Regards,
Steve