These days, while traveling, I tried to work on my large DB with PanX using a 13" MacBookAir.
No problem generally, but I noticed a nuisance (for me).
As the main window of the DB is wide PanX makes it cover a little more than the screen, that is no problem as all field names are visible. However, If I click on a cell of the rightmost field to see its content for a given record (to read it or possibly correct it), the pop-up windows opens towards the right from the left limit of the field and thus to read the deployed cell one has to move the main window as a whole to the left.
That is not the case in Pan6 that opens correctly towards the left from the right limit of the screen, exposing the full opened cell on the screen. I think the behavior of Pan6 is correct and all pop-uo windows attached to a given main windows should stay inside the limit of the screen.
I am joining a picture of what I am trying to describe, showing the same DB opened in PanX above and Pan6 below, with one rightmost cell deployed.