We've just upgraded to Moodle 3.4.2+ and so to Essential 3.4 and found an issue in the Turnitin Assignment plugin using IE.
All the Turnitin Assignment tabs display fine but clicking on the Submission Inbox ends in a failure. The page loads, the animated Synchronizing Data thing displays, the submission table displays briefly with all the submissions there and then the page refreshes itself. That all looks normal but after the refresh the submissions fail to display again and the submission inbox looks like this:
Clicking Refresh Submissions doesn't work, neither does refreshing the page. The only workaround I've found is a force refresh (Ctrl + F5). Although, interestingly, when I turn on developer tools and enable network traffic capturing, the submissions always load, every time, which (as I don't crack open the dev tools often) makes it difficult for me to work out where the failure is occurring.
I've tried previous versions of Essential 3.4 with the same result. We were on Moodle 3.2 before the upgrade with no problem there.
I'll warn teaching staff about this issue but it would be nice to find a fix.