I just upgraded to the latest version (I tried both 1.3.1 on the App Store and 1.3.2 on the website) and I'm having a problem when trying to push a change to a Google Code Git project. It says that I have an invalid username/password combination. I tried searching everywhere but can't find a place to type in my password for the repository. I even tried creating a new connection to the repostiory in hopes that it will ask me for authentication via a popup dialog or something similar, but I still get the exact same problem. It never asks me for a password for my repository, and I don't see a way to enter in a password.
If you don't use SSH keys to authenticate (which are the most secure and convenient way), SourceTree intercepts password prompts from Git and provides a pop-up dialog - at least it does in every instance I've ever seen. I don't have any Google Code projects though, I've mostly tested this with GitHub, BitBucket, Gitorious and so forth. That said, they all work the same way.
If you're not getting a prompt, maybe the URL you're using already has the username & password embedded in it? That's a bad idea but if that's what you've got it might explain it.
Otherwise, when you do 'git push' on the command line, what prompts do you get?
Awesome, thanks! The problem is that by default Google tells you to use a URL in the form of https://USER@code.google.com/p/PROJECT/, which was what I was using. However, after seeing your comment, I removed the "USER@" part and it now prompts me for both a username and password!
In my case working with Gitlab and SSH keys I had to remove the entries in the keychain...
When Sourcetree asked for the password, it wasn't properly saved in the keychain (it looked like it was saving just one character), so I manually overwrote it.
After that I granted Always Allow permissions when the keychain prompted to allow Sourcetree to access the password, and after typing the password there, it started working properly again.