Strange classes have appeared in our file(s) in Architecture Posted June 16, 2008 Christian, Thanks for your insight. I have experimented to verify that the strange classes were not affecting the stairs. They appear to be separate issues. I notice in other places in the forums there are quite a few of us frustrated with the stair tool. It works but not really! I have also discovered that deleting the offending classes clears up the too many classes to scroll through issue. The file is free from the extra NNA#? classes and they have not returned. (Yet!) Again, thanks for your insight.