Puntuado con 5 de 5 estrellas
@MatB: I cannot confirm this. I am running Windows 7 (64Bit) on my laptop and have just recently installed TB 12.0.1 and it works out of the box.
Did you configure the user/login/url correctly?
Did you restart TB after the installation of the plugin?
If you leave those fields empty and click on the "Create Jira Issue" menu entry the configuration dialog should pop up immediately.