On April 14, 2015 Turnitin annnounced that students submitting documents to Turnitin via Google Docs may encounter a submission error.
“Turnitin is aware of a possible issue submitting documents to Turnitin via Google Drive™ online storage service. Users attempting to submit via Google Drive™ may experience an error 400, or other type of error screen. We believe this may be caused by some back-end changes made by Google which conflicts with the current integration process. Our engineering team is working to resolve the issue. Please check the following URL for updates: http://go.turnitin.com/e/45292/VNSZUT/99vbg/346785143
In the meantime, please use an alternate submission option. We apologize for any inconvenience this may cause.”