Quickbooks web connector needs to be running to keep the sync up to date.
To Open Web Connector and Resync - You may need to restart the web connector if the computer has been shutdown or restarted.
Login to Quickbooks > File(Top Left) > Update Web Services
Check the box to the left of Payportal > click Updated Selected
To Verify if the Web Connector is Running
The Web Connector icon shows up on the taskbar
If you do not see the icon on the task bar, check the icons near the clock on the bottom right of the screen
You can also verify through the task manager (CRTL + ALT + DEL > Details Tab)