Hello Megan,
Sorry to hear that you ran into this snag.
If this behavior is affecting all of the projects that you publish, even newly created ones, try doing a repair of your Storyline 360 installation to see if this helps.
Additionally, can I ask if you are using more than one monitor when publishing your course? There's a chance that the window prompt might be appearing on a different monitor, or being hidden behind other open applications.
If repairing Storyline 360 doesn't help, please open a case with our support team here so we can take a closer look at the behavior.
