Every three weeks, Canvas makes updates to the site to enhance the functionality and usability and implement bug fixes. The latest update includes a change to how quickly you could see a Turnitin Originality Report for Turnitin assignments. Previously, an originality report could come back in as little as 60 seconds. Now, it will take about five minutes. Why the change? Sometimes, papers submitted to Turnitin via Canvas would appear as if nothing was submitted and no originality report would generate because the request to Turnitin would occur before the entire paper submission was processed by Canvas. This bug is now eliminated by giving Canvas an appropriate amount of time to process the file upload before sending it off to Turnitin for review.
If you have been using the checkbox in assignment settings to generate a Turnitin Originality Report, remember that this feature is going to be disabled by the end of 2016. You must edit your Turnitin assignments and enable Turnitin via the External Tool submission type in order to process an Originality report. More details about this change are linked in a previous blog post here.