I uploded improved drawings of T-piece (B1-15, B1-80, B1-100) for threaded pipes. Original drawings have bugs since LinearDesktop 9 and they still didn't change it. You need to put new drawings into folder c:\Program Files (x86)\liNear Software\TGA-Bibliotheken\Neutral Piping\Materialklassen\3D\; check if you have same path.