Turnitin updated Feedback Studio on 14th December.
The most important improvement appears to be this one:
“Fixed an issue where instructors were getting timed out of the Feedback Studio if marking student work for over an hour”.
https://guides.turnitin.com/01_Manuals_and_Guides/Administrator_Guides/Feedback_Studio_Success_Kit/Feedback_Studio_Release_Notes
We believe that this timeout issue may have accounted for issues experienced recently by a few staff at Reading.
As we understand the situation, leaving feedback within the Feedback Studio window was – incorrectly – not being counted as activity, with the result that staff could be logged out of Turnitin when they had been marking for 60 minutes. This has now been fixed.
User activity within the Feedback Studio window (e.g. key stokes and mouse clicks) will now reset the timeout clock. Therefore, the 60 minute timeout should now affect only those users who have the Feedback Studio window open for over 60 minutes without clicking or writing comments.
If you do encounter issues when marking using Feedback Studio, our advice remains: switch back to the old Turnitin interface, ‘Turnitin Classic’.
There is a link to do this at the bottom of the Feedback Studio window.
(for more detail see our Feedback Studio User Guide)
You may also be able to avoid problems with the Feedback Studio by clearing your browser cache:
IE11
https://support.microsoft.com/en-us/help/17438/windows-internet-explorer-view-delete-browsing-history
Chrome
https://support.google.com/accounts/answer/32050?hl=en
Firefox
https://support.mozilla.org/en-US/kb/how-clear-firefox-cache
Safari
https://kb.wisc.edu/page.php?id=45060