I installed 1.7RC4
While exploring the new features / layout I clicked on the Open Ticket OsTicket installed. I selected edit and then selected Due Date. I set the date to be today and 15 minutes from Now (currently 9). I received the message "Due date must be in the future" I found that if i set the time to 16 it worked.
I am not sure if this is intentional or not but it seems weird.