There is a logical problem on the prev/next links while using more than one cat for a link.

Example:
Link1 in Cat1
Link2 in Cat1
Link3 in Cat2
Link4 in Cat2

On detail you could go from Link1 to link2 and vice versa; from Link3 to Link4 and vv.
Problem while:

Link1 in Cat1
Link2 in Cat1
Link3 in Cat1
Link3 in Cat2

Link1 to Link2
Link3 to nowhwere.

For my special needs i want the order for next/prev only for one single cat, beacuse every link is in this cat. Has someone a clue where to hack what for this?

In Example cat1 would be the master-cat.