Controlling extrusions
 

While Extrusions are supposedly very basic operations I have had innumerable problems controlling them.
The most annoying one involves having an extrusion with a non-uniform cross section.
It is somewhat difficult to explain, but I will try.
Imagine trying to model a picture frame using an extrusion.
First you draw the path (overall size/hape of the frame) and then you draw the cross-section of the frame. The problem appears when the cross-section begins to "stretch" so that when the two ends of the extrusion meet, they are of different sizes.
This problem appears about %70 of the time, meaning sometimes it does, others, it does not.
I assume it is a setting somewhere.
any ideas?

Happens all the time to me... The easiest way to fix it is to take two of the edges, and scale them so they match the other ones... Thats what I usually do anyways, that would be cool if there was some kind of setting, but I am not sure... Good luck getting info, I am curious to what others have to say. Thanks,
Brian