Very slow page loading and security alert

hmmmm. a new server hey? Trouble is, I can't even get my page to load. Probably me. Anyone else having problems this morning? Can't log in as page won't load. Using Opera; when using Firefox it finally did load. But very very very slowly. Could this just be because of the server change? A security alert also tells me that the server's certificate chain is incomplete and the signer(s) are not registered. Should I worry?