You must allow BaccS to connect to the Internet at least once every 14 days. During this connection the program will check that you remain an active Plus package subscriber. During these 14 days the program can be used without an Internet connection.
If your Plus subscription expires or you cancel it, the program will switch back to Demo mode. In this mode you will be able to view and edit all your data, but, among other limitations of the demo version, it won't be possible to create new jobs and invoices (beyond the allowable limits).
Sometimes the program may be switched back to DEMO mode while you're active Plus package subscriber. Usually this means that connection with your ProZ.com account was aborted for some reason. Just please open program Settings, select Integrations tab, and click Connect button in the ProZ.com group.