Hello Scott,
this is designed behaviour. If HippoEDIT is in expanded(maximized) mode, and you want to see one of the panes (of course if it is not that pane that currently expanded) it should be un-expanded before.
In the expanded mode, no other panes can be visible. So that is a reason that it turnes off expanded mode before.
The pane can be docked, tabbed, in auto hide mode, floating or hidden. There is no state for pane to be visible in expanded mode.
The bug you have reported was caused specially by this undefined state. And this was solved

Yes. Maybe this was not that you want, but this is how it is designed

Overwise pane come from nowhere, without outer containers etc.
Best regards,
Alex.