Autodesk Mechanical Desktop

[#1]

I get a fatal when i'm using multiple viewports in MCAD5.
When I gripedit an entity, the moment I select the grip ACAD gives an error. This only happens when I have 2 or more viewports in modelspace. The problem also occurs in Mechanical Desktop 5.
I am using a 2-monitor machine but colleagues also ran into the problem

[#2]

Hi, I'm facing a similar problem. When trying to create a second viewport on any given file Autocad crashes corrupting the file.. Please, any help will be aprecciated. 

Saludos.