Is there any way to turn off portal highlighting for specific portals? I have a few one to one relationships that use large sized (as in a 400x400 pixel rectangle containing 10 fields) portals to display information, if the user misses the intended field with a mouse click they are greeted with a large black rectangle. Not the end of the world, but it is ugly and I know it will cause confudion for some of my users.

You don't need a portal for a one to one relationship. Just put the related fields on the layout.

No duh? I have barely any excuse for why that answer wasnt obvious to me and of course I have previously developed layouts in the fashion you suggest.

This is my brain on working 60 hours a week & learning 3 new (Computer) languages at the same time.