In SW 2010 when I would insert a louver, it worked properly and left me with an open bottom louver exactly the way it was supposed to, as you can see below.

Since I have upgraded to SW 2011 I am unable to properly insert louvers. The louver will insert but only if there are no faces assigned, which leaves me with a dent and not an open louver as seen below.

Once I assign the stopping face and the face to remove, it starts telling me on insertion that "This feature will create disjoint bodies. Multiple sheetmetal bodies are not supported."

If I open a part from 2010 that already had louvers, they look fine, but if I try adding more using the exact same forming tool used previously, I get the aforementioned error, until I delete the forming tool assignment from the louver file. That brings me back to the bottoms not being properly open. Is this a bug perhaps? A change in the way the program handles forming tools/sheet metal? Im stumped.