There has been an update to this issue in a post from 5th January 2023. Please refer to the up to date instructions in this new post.
You may have seen an issue with equations not displaying properly in some browsers when using Blackboard. This was resolved by Blackboard on the 6th October, however the DEO have recently received reports that a small number of users have continued to experience issues with equations they have previously viewed in their browsers. If an equation is not displaying properly for you, please clear your browser cache and cookies (using, for example, these instructions), then reload the page. This only needs to be done once on the device and browser being used, and can be done at any time (for example, in advance of taking a test which includes equations), after which the issue should not persist or recur.