Ok, there seem to be a mix of problems reported here, but let me chime in. I had a working 2.7 installation until this morning. All of a sudden when I click on login I get a blank page — no request for passwords — nothing. https://www.macgardens.org goes to https://wp.macfusion.org/wp-login.php and it’s completely blank. Some of the solutions discussed here sound like they would wipe out my whole website. I’ve emptied the cache, deleted the wp cookies, looked at the error log, and renamed the plugins folder. Nothing changes. Drop your database? What does that mean and imply?
