I looked for this in the forum, but couldn't find it. About 2 days ago all my user host stats disappeared, and are only slowly reappearing. Is this some sort of issue, or is it just a temporary problem? My credits are still there, but I cannot compare different hosts at the moment. Let me know if anyone knows what is going on.

I think that your CPID changed. That's why you have lost you stats, and now they are reappearing in the new CPID.
As for comparing hosts. I think you should try again. I've tried and compared successfully the first two of your hosts