I'm not sure if this has been raised, but I thought I'd post a video demonstrating the problem.
The symptom is that after a bar swap, skills can no longer be executed. The fix is either a single or double tap of the escape key.
You can see that I hit Impulse, but it doesn't actually execute it until after I swap bars. Then, nothing on the back bar will execute and I can't swap bars back. You can hear (and see the results of) me pressing the escape key, then things start working again.
I hope this video helps to resolve this issue as I'm sure I'm not the only one experiencing this.
youtu.be/ecr6AyNjucU
-Aletheion