I decided to give your UL ROM another go and the screen off issue remains, again after several flashes. I also still can't access the address book to select contacts, after disabling, enabling, disabling the skin (after several hours of dis- and then enabling the skins I got tired).
It's odd that I'm the only one experiencing these problems, meaning there has to be a bug somewhere that is very rare. To clarify the problem I will try and explain it in detail.
When I click the button to turn the screen off the screen switches off. A second or two later the screen switches itself back on but the phone is locked and the screen is dim (50% brightness). Now whether I click the button to turn the screen off or unlock the phone and then turn the screen on the screen turns itself back on again. It doesn't always happen, sometimes, when I've prayed to the gods of screen offs, sacrificed a cat, dog and my offspring the screen will stay off. But this is rare and the battery is drained very quickly due to the screen simply refusing to stay off.
Last night it drove my wife over the edge and she demanded I install a new ROM, as she's a light sleeper and the light from the phone, though dim, irritated her enough to prevent her from sleeping deeply. I love the ROM as it's the best Sense ROM I've found but these two bugs make it hard to live with. It's a shame because the 70MB RAM free is wonderful and makes the phone snappy. My wife loves the constant animation of the weather page and wants me to download a ROM for her Desire, which I'll do once I've solved my own problems.