Hello Michael,
I noticed the changes :)
however I installed Codys dark theme (http://moi3d.com/forum/messages.php?webtag=MOI&msg=9242.1) and that screwed the dragging of the pane.
It was \ui\commandbar.htm or \ui\_newcommandbar.htm.

Will notify Cody as dark theme with modified UI was great for me.
But some other features might get impacted so I leave it for now :(

Thanks a lot for explanation.