This has to do with web browsers caching of site data and can be fixed by clearing browsing data. The process is a bit different depending which browser you are using. If you are not sure how to do this visit refreshyourcache.com which explains how to do this for each browser.
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Welcome to Birkbeck Moodle
Following the recent upgrades of both Moodle the Turnitin Assignment 2 plugin, there have been a few reports of problems accessing Turnitin assignments. A message stating "Loading data from Turnitin" is displayed indefinitely.
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