ej, I 've the problem that if I copy an object and use crl+m to flip it, you can look trough the faces of the object… how can I stop this?
after you mirror the object press tab to get into edit mode, preaa A untill all faces are selected, then press W and choose flip normals.
Doesn’t work…
select the object and try control N with all faces in edit mode.
If that dont work, file a bug report.