I have a hinge assembly that is constrained properly, and operates correctly. I insert multiple copies of this hinge into a larger assembly consisting of two boards and four hinges. In this higher-level assembly, the hinges are set to "make flexible", and "Minimum Motion" is turned off. One half of each hinge is constrained to the first board. I can constrain the second half of ONE of the hinges to the second board. Motion of the two boards is correct, but the other three hinges do not move (of course), because their second half is not constrained to the second board. When I try to constrain the second half of the three remaining hinges to the second board, Alibre INCORRECTLY reports that the system is over constrained. This would be true if the hinges were not "make flexible", but in the case that the hinges are flexible it is not correct -- nothing is binding the second half of the hinge. And to preemptively quash the arguments -- No, there are not any problems with the alignments, etc. in the hinges, nor the boards. Every indication is that things are co-planar, parallel, perpendicular, etc. The behavior is that Alibre is only looking at the degrees of motion of the two boards, and not considering the flexibility of the hinges. Is there a workaround for this behavior? I would consider this a bug, but don't know where to file it.