Sourcetree Authentication failed

[Roman Colaneri]

I don't know what happened to Sorucetree but suddenly it started asking for my username and password and rejecting me. I can log perfectly to the web page but source tree keeps saying Logon failed, use ctrl+c to cancel basic credential prompt. remote: Invalid username or password

I even tried changing my atlassian password and same results, I can log in the web, to see my repository but Sourcetree doesn't want to log to push the last changes! However it shows and refresh the remote branch. The "bitbucket login" window appears when I try to push changes.

I need to continue working and this is making me crazy. I don't know what else to try. Any help will be highly appreciated!

Sourcetree v2.3.1.0 / Windows 7 x64

Regards.-

-- EDIT --

I just updated Sourcetree to v2.3.5.0 and still failing. It is impossible to log.

[Roman Colaneri]

I tried something that works... I opened the terminal (Actions / Open in terminal) and executed a git push

First sourcetree again showed the login window and failed to log in, however after that another login window appeared and that accepted my password! The terminal made the push successfully. 

So I understand that the GUI is asking for another account... or something like that, but I only have 1 account. So any clue?