I made 3 surfaces and pasted them together in my FG surface and all was fine. But after some time one of the surfaces goes bad and develops red strike out circle in the definition tab, and no longer displays in FG. There are no circular refs and the the host is a native. Everything seems lean and clean. Any ideas?
Joseph D. Bouza, P.E. (one of 'THOSE' People) Civil 3D 2012 & 2013 HP Z210 Workstation Intel Xeon CPU E31240 @ 3.30 Hz 12 GB Ram
Note: Its all Resistentialism, so keep calm and carry on