I am new to titanium. After starting the software it turns out, that I can not create a new project, as the button "Create Project is grayed out.
What error might I have made?
I'm new to Titanium, but I have found that this will occur if you have a "-" (dash) in the App ID field. IOW, com.xxx-yyy.appname WILL NOT work, but com.xxxyyy.appname DOES work.
I had the same issue. In my case, it was that I'd left the Company/Personal URL blank.