Using my Win 8.1 PC, Mudcat would either not open at all despite "isitdownrightnow.com" stating it was online, or on the rare occasion it did open it would not let me Preview, or Post... Several times I flushed Chrome cookies and browsing data, and even rebooted my router & PC; and that seemed to open Mudcat, but as soon as I logged in, it stopped working again...???
However, at various times when my PC would not connect, I could access Mudcat using Android devices - but I can't remember if I logged in or not, probably not due to Android security issues on old Tablets...???
If I was a paranoid kind of bloke who believed in conspiracy theories, I might even have started thinking my PC was being targeted and blocked...!!!??? 😱