Hmm --- I may be wrong, but it sounds like a graphics issue, where OpenGL basically could not setup for rendering. I believe the message seems to come from TCL because the AC3D code that sets up the rendering context is called from a TCL command (TCL is a scripting language, and in the case of AC3D allows a cross-platform GUI + interface to the core ac3d app).
At any rate, that TCL_LIBRARY message looks normal...
Did AC3D work prior to the new video card? What kind of video card is it?
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