When using the Git Fetch button I am asked for my password.
I type this in and tick "Remember".
The next time I load PHPStorm I have to add my password again.
I was also unable to install the update from 2016.3.1 -> 2016.3.2. I had to uninstall and reinstall fresh, which I assume is part of the same issue.
Running windows 10 Pro 64bit