In fact, when 3ds Max 2013 opens, the bar "Viewport layout tab" is not in the interface. Yet the status of bare active. I then deactivates the option and active again, the bar "Viewport layout tab" appears in the upper left corner of my screen first. I "Dock" in the 3ds Max interface, and voila.
But when I open 3ds max again, I must repeat the maneuver. I reset 3ds max (max. .. ini), nothing to do. I started 3ds max into another language, no problem. The problem is in the English version. I confirm that in the first few months, everything functioned properly.
This is a minor problem that does not affect the proper functioning of 3ds max, but it is an irritant. If someone has a suggestion, appreciate it.
Ridgi
(Googol translation French to English)