Keep getting signed out and can't add blocks

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I have a website that was working just fine 2 days ago.

I went in to add some content on one of the pages and when I click add block > content the box pops up but nothing happens.

I installed a new add on two days ago, but the site was working fine after the add on was installed. I went into installed and available add ons, clicked edit and it brings me back to the login screen. If I attempt to go back into the dashboard, I cannot without logging in again.

I have built many c5 sites and I have not run into this before.

I have tried this on 3 browsers, cleared the cache on all, etc. Nothing has changed.

Thanks for any help you can provide

globalnerds