Can't boot to ISO bootable images

On the recent update to P3 I noticed that my cd-roms set to bootable ISO images no longer boot.

If I make a physical CD from the ISO, and instead attach to that, it will boot correctly.

Has anyone else ran into this?

Note: the same ISO image files boot under Fusion, but all my VMs are in Parallels and I'd like to keep it that way.

Tks/Kevin