I'm using Auto Cad 2010 and was confused to find out model space dimensions(annotative) are not visible in the layout.
There was no particular problem with layers,scale etc.
At least i got it and thought it'll help you as well.It is just a matter of a button at the bottom right hand corner.(Highlighted)Annotative dimensions are not shown unless the button is turned on.
Click on the 'trillium button with a light bulb'.
This will turn objects from all scales on or off.
you can also type "ANNOALLVISIBLE" in the command prompt.
