Let's isolate this error for a possible browser-related, @tarnzen.
As an initial troubleshooting steps, let's start using a private browser. Then log into QuickBooks Online, and if you aren’t receiving error codes, then you’ll need to clear out your browser's cache.
Sometimes if the cache becomes too full of older data, it can cause viewing and performance errors within QuickBooks Online. Clearing it will force the system to refresh and get everything back to running smoothly.
Clearing the cache did not do anything and I've always used the browsers needed. I was able to get into payroll when using the private mode, which I've never had to do before. Hopefully this isn't a continuation, as no one has responses on what the actual error means.