While using power designer, I have ended up with a mess of lines for references from one table to the other. While these lines are orthogonal, they create a mess, hiding behind tables, etc.
Is there a way to make them snap to grid lines so they are more readable?
Which version are you using? With version 15.0+, there is an auto-layout tool, under Symbols > Auto-Layout, which could help to avoid the routing by reordering the tables.
I think some efforts have been made in 16.0+, around links crossings.