
I feel like a fool!
I tried my method with a standard cabinet and got the same results as Dan and Kerry and whoever else tried it. The doors stayed equal widths and strayed over to the one side. Then I opened one of the cabinets that worked...mmmm and found the difference.
These were cabinets for database servers that had to be rack mounted. The standard door on these are too wide when opened and I had to design and build double doors made out of sheet metal with fans built into them. The only access that was needed was to change the backup media, so the client specified the difference in door width. (Kerry, this was only the second time I had to build doors with different widths)
Ok NOW...these doors are inset into the cabinet by 20mm. Then the settings work.
Thats why it also works with face frames.
When designing the doors I saw the setting of 'reveal open end' and thought I would try it. Viola! it worked. I decided that if I get another request like that, this is the way to go.
I think the odd behaviour is a bug and I shall report it as such.
So, Gene, for frameless cabs the tried and tested method of inserting a divider is still the best way to go. (And of course the added benifit that you mentioned of being able to specify different hardware)
Hope this clears the mystery.