I just checked the OUtput Window and these are the messages I got on performing that boolean operation. problem in ResolveNonSolidShell problem in ResolveNonSolidShell problem in ResolveNonSolidShell problem in ResolveNonSolidShell problem in ResolveNonSolidShell problem in ResolveNonSolidShell problem in ResolveNonSolidShell problem in ResolveNonSolidShell Doesnt make sense to me. Does it to you?