Totally unable to switch Google accounts

This is what works for me:

When I want to login into one of my GMail accounts, I visit this URL:

https://accounts.google.com/Logout?continue=https%3A%2F%2Faccounts.google.com%2FServiceLogin%3Fsacu%3D1%26il%3Dtrue%26continue%3Dhttps%253A%252F%252Fmail.google.com

This will log me out of whatever Google account I was logged in previously (if any), and give me 2 empty login fields (username & password). After logging in, I'm redirected straight to GMail.

To get this workflow semi-automated in my password manager (I use KeePassX), I created a shortened URL:

http://tinyurl.com/mokz32r

because the program didn't play nicely with the URL encoding.