All of a sudden my sambpos has gone to trial version ?
Have you been using trial mode?
Do you have autobackup or work period close?
What version are you using? (double click logo in top left when in admin to un-maximise and the exact v number is on header)
There was issues with dropping licence on one version at a point when going in and out of training mode or closing samba before backup completed.
Just reactivate or if needed login at sambamarket.com and clear licence keys then reactivate in samba.