Syncing With QuickBooks From Multiple Devices

DO NOT sync with QuickBooks from multiple devices! 

Select one of your devices or Macs that is the fastest, and has the best internet access (WiFi or wired connection) and always sync with QuickBooks from just that device. 

In theory, it would be possible to sync with QuickBooks from multiple devices, but this requires that all of your ContractorTools data has been completely synced between the devices, and that cannot be guaranteed at any point in time. So the best procedure is to only sync with QuickBooks from a single device or Mac computer.