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Clearing your cookies/cache on your web browser can alleviate website issues, clear any cached logins, or fix broken elements. Depending on what browser you use, there is different ways to clear this. This article from the University of Iowa does a great job on how to do this.
How to Clear the Cache and Cookies in Your Web Browser - University of Iowa (external site that opens in a new window)
Note - clearing cache/cookes will remove any saved logins for the site that you may have. Please ensure that you know all of your logins or have them saved somewhere you can access to login again