hi,
first of all, sorry for my english, cause i'm french.
I've got the same problem than you,
the solution i found is to change in the options of all the objects, lines or other elements.
In "plan et coupe"(translate), you can change the 1st otpion which is : "show on steps" --> you turn it like you want.
But if you have a lot of things to change, it's very hard to change all the objects like this, so if anybody knows how to show all the objects in all the steps with AC 12, please help me/us.
Sorry for bad english,
R. Favre