Here is the same as original message WITH images. I was wondering if anyone there has run into this one? After adding Prop delay property on nets in schematic (Concept), package to Allegro, all nets are assigned to a Matched Length group in CM. Set target, add delta / tolerance and assign pin pairs as Longest Pin Pair. Everything is fine until packaging schematic changes to Allegro next time! After packaging, the delta / tolerance is defaulted back to 0 mil:5%??? Thus causing all Prop delays to fail. Any Ideas? I just finished a design using this method, but it never did this. P.S. I really like the idea of assigning in the schematic. Thanks in advance, Mark |