Fun with material on interior generating on exterior.

[MDC]

Has anyone here had trouble with material choices selected for one side of a wall replicating itself on the opposite side of wall, even though the material selection dialog indicates that it shouldn't?

This has been a perplexing issue. Brought it up with tech support, but they don't seem to be interested.

I'm hoping it's something I just don't understand about the software rather than a bug that has to be worked around.