Control Panel access. Greyed out button The Admin login screen for my site is not working.

The button to submit my credentials is greyed out and submission by pressing enter is not working either.

Not sure how to go about solving this one or updated the site to fix it if there is a bug?
If your look at your browser's console on that page you'll see your getting several JavaScript errors:



Which seems to indicate that some of your files didn't FTP up properly and are corrupted.  Try re-uploading your files and make sure your FTP client is set to transfer in 'auto' mode.