It's not a miracle
I downloaded ervius Visual Kitchen 1.8.1 und exract it on my local harddisk.
Then I copy the rom folders from your ATT Dump (EXT, OEM, ROM and SYS) to the directory where I extracted my kitchen.
Also with the new exe of VK (1.8.2) no errors, or strange behaviour.
Today I played a little bit with reducing the ATT Rom. Every build I create works just fine without any complications.
At the moment I build different Versions with XIP/SYS 23060 and later I will try to get Manila 2.5 working.
EDIT: I work which the latest HSPL and Radio version for my Topaz on an Windows 7 Build 7600 OS
HTC HD7 WP7.8
WeTab 80GB SSD, 2GB RAM, Win8 RTM