It seems to work for me in WF4 M080. They look a bit odd in the part level and cannot be set active at the part level, but I can use them in a drawing and get what I'm expecting. If I use an enclosed sketch to define the cross section, it gives some odd results, but if I only use open sections in the sketch, it works as expected.
Russ, Thanks for the response. I also submitted this to PTC and they duplicated what I got for a result and said they could not get the material to be removed on a one sided offset x-section either. It will display the x-sectioning, but not remove the material. They told me it was put in as an enhancement request in WF2.0, but never implimented. I found a work around for my needs on this. Dennis