I have the same problem on my account. I have three projects, and have no problem with the sync of the first two.
I have added myself and one other user to the new project through Account/Users/Edit, but the third project refuses to sync either to the other user's Android device or to my iPad.
I removed myself from the project, and re-added myself, but still no sync. I have added songs and a setlist to the new project through the Web interface, I can switch between the three projects in the Web Browser, but I can't see the third project on the iPad. The iPad does sync changes in the other two projects, so I know it is correctly logged in.
Any hints what might be missing?