...so, you might not consider this a bug, but I kinda do.
What do I mean? This:
When you finish a learning session, you get the dialog in game to pop up. Great, learn a new skill!
You have two actionable widgets, the dismiss button [x] & the [Learn a new skill (opens in new window)] button.
In my mind, when you select the option to learn the new skill in the second window, that *should* make the modal dismiss, just as [x] does, which would save the click when focusing back on the in game window.