I have an issue occasionally with it just spinning when you try to search or open an email.  It usually resolves fairly quickly if you just let it be.  Sometimes I have to close the program and then reopen to resolve.  Then it goes back to working normally.

You can also try a hard refresh. That clears up a lot of issues for me from time to time.

This blog post shows how to do it in different browsers on different operating systems.

Link: https://www.ideamktg.com/blog/what-is-a-hard-refresh/

@max  Thank you!  I am going to share this information with the team.  We may need to do this on a few of our systems.  Great information!