We just started using X17 this week and have ran into some major snags with this as well. I personally use two different Mac machines and have found this new feature to be very confusing. We have always stored our plans in Dropbox which has been flawless as everything was simply files and folders. With PM that concept isn't by default going to work with two different machines as it stores the project management data locally in the Library folder which is on each Mac machine individually.
We do use the iCloud feature of the Documents folder being synced to all devices which works great in general. My first idea to solve this is to go into Chief preferences and change the folder used to save project management to a folder in my Documents structure which will then be accessible across my devices.
OP are you using Windows or Mac?
