Installed yesterday, Control Panel not working

I've just installed vBSEO yesterday. When I click on the control panel, it goes to a Please Wait.... page and just stays there.

How can I repair this?

Please make sure you followed installation instructions correctly and performed all installation steps.

Yes I did. It was working fine yesterday and this morning, now it just stays on Please Wait.

You may have entered something incorrectly into the config file. I would suggest re-uploading the blank config.xml file and try again to visit the CP (your settings will re-pull from the datastore). Make sure it's 666 before and after uploading.