I have experienced this problem before, but have found no solution. Sometimes I am unable to move the faces of 3DSolids and get the error messages like "Modeling Operation Error: Gap cannot be filled" or "Modeling Operation Error: No solution for a vertex". Haven't found a pattern of error yet, but today I copy clipped some 3D solids from another drawing into my current drawing and found that the move face wouldn't work after that. If I draw a simple 3D solid within the current
drawing, the move face won't work; but, if I copy clip that same object into a new, blank drawing, the move face works. Odd...
Thanks - John
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