[Couenne] Couenne returns infeasibility for feasible instances

[Luca Mencarelli]

Dear all,

I am using Couenne to solve several non-convex MINLPs. The problem is that
when I set "min 0" as objective function Couenne finds a feasible solution,
nut when I change the objective function Couenne returns infeasibility. I
have already tried to deactivate all the bound bound tightening options,
but Couenne returns always that the instance is infeasible. I can provide
the .nl files if necessary.

Thanks for all your help. Best regards,
Luca
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