I agree, it works much better with only one session of Logic and one session of Layout.
You start the cross probing in Logic. In the Pads Layout dialog select the 'Document' tab. Select <Open> to select the proper Layout design to cross probe with.
I don't believe you can have mulitple cross probing sessions running at the same time... let me know if that works.
No, doesn't work. That method closes the current session only to reopen it again.
Interesting. When I hit 'PADS Layout' in Logic to cross probe, Logic will link with the first Layout design that was opened. Hitting open only reloads the design into the first session of layout. That isn't the way this used to work; Mentor must have changed this in 9.#. It appears that now you can only cross probe between the first instance of Logic and the first session of Layout? Good question for SupportNet.
I have Sch B and Layout A open. then I open Layout B. Cross probing is from Sch B to layout A. When I hit <open> and select Layout B, I now have two copies of Layout B open, and one is cross probing.