Hello thanks for taking the time to reach out to us, here in the forums. To answer the first comment, we do filter out these types of words and website redirects, but sometimes these spammers can squeeze through by adding an extra space or character to the post, unfortunately. If you are able to provide us with a screenshot the next time you see this, it would be very helpful to us.
The other error you are seeing does appear to be due to needing to clear the cookies and the cache in the web browser settings. Once the cookies and cache are cleared out, the site should work as normal. Let us know if this helps!
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