a) All VP tabs disappear while the query is loading (usually a couple of seconds) & re-appear once loaded.
b) If the VP has many panels and loading takes a little longer (e.g 4+ sec) the tabs do not re-appear.
Tabs visible before clicking on the Orders tab

Tabs disappear while loading the Orders VP Panel (tabs should be where the dark blue line is)

Tabs disappeared once the VP Panel is loaded

Cheers