So i just built a house and the master bedroom was on a split level on the bottom. Then i decided to get rid of the split level and add floor on the top of the bottom level. Every thing was covered but i couldn't delete the railing for the stairs going into the split level. I could delete the stairs but the railing remaind. I used the sledgehammer and click on the railing and it said cant delete
Could you post a screenshot of this? Also, try going up or down a level and try deleting the railing from there. Can you do it with the sledgehammer, or by selecting the railing tool and clicking on it with CTRL pressed?