well can post some SS's of what i have noticed myself as far as hotbars go i use Fetish UI.
this was done on a new toon no servername_toonname_eq2_uisettings.ini file was loaded was just what the game created.
all SS's where taken after i doubled check to make sure the window was not locked or didn't have click through checked also
Screen Shot 1 Pre LU 39 would be able to move the hotbar from their but after LU 39 you can no longer do that and it is the iconbank
Screen Shot 2 also Pre LU 39 would have been able to move it like it is but again unable to since LU 39
Screen Shot 3 no change for the spinner bank as far as moving the hotbars go still
Screen Shot 4 showing back grounds via F 10 key window was unlocked but sadly iconbank doesn't allow the hotbar to be moved as it did before LU 39.
hope that helps someone