So after getting forcibly logged out of my own account when the cookies expired after a year, I found myself in a similar situation and the "forgot password" thing didn't work at all despite having given it an e-mail when I registered.
Chitib found the solution.
In firefox or chrome
-right click the site
-inspect elements
-go to the console tab
-At the bottom of the window there's a line you can type in, type:
document.cookie="pass_hash=yourpasswordhashhere; expires=Thu, 18 Dec 2014 12:00:00 GMT; path=/"; document.cookie="user_id=youruseridhere; expires=Thu, 18 Dec 2014 12:00:00 GMT; path=/";
With the appropriate info and dates replaced of course, and you can log in manually.
The instructions for how to retrieve this info from your cookies can be found
http://ibsearch.i-forge.net/mass-upload/howto-auth.htmlthough it's a little dated.