Thanks for reaching out about this here in the Community.
Have you already double-checked your browser is fully up-to-date? If it needs any updates, everything might work just fine after.
One more thing you could try is to see if you experience the same issue by accessing the web player in a incognito window.
In any case, together with checking for any browser updates, try clearing the browser's cache and cookies as well in order to use a freshly functioning (cleared of any temporary flaws) web player when you open it after.
Hope you'll find this useful. Let us know how you get on!
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"There's more to living than only surviving." - Dexter Holland