I went back and examined the structure of the P8Z77-I Deluxe dual boot. While it is dual booting with Clover 2359 easily, Clover is not installed for UEFI booting - it is installed for Legacy boot. I spent some time Sunday afternoon and tried to replicate your problem - succeeded all too well. With Clover installed UEFI boot to OS X drive I could see the Boot from Legacy HD1 and Boot from Legacy HD2 icons, but neither one will boot the system. Selecting HD1, which should boot Windows, results in an underscore in the upper left corner of the display and there it stops. Same thing with HD2. No matter what I did those two icons would not boot the build. It is strange, also, that Clover does not properly name the partitions as it should. When using Chameleon and any of its branches those icons are labeled System Reserved and Win7, not HD1 or HD2.
So I thought to test the latest Clover 3270 installed Legacy mode instead of UEFI mode. And that did not work either - now it just gives me a 3" white square in the center of a black screen with a smaller square centered in it with yellow and black diagonal pattern. Not sure how Clover has changed or maybe it is the way Windows booting has changed, but your options seem to be to convert the Windows drive to UEFI installation and use Clover or use Chimera as your boot loader.
