Emulator

What steps will reproduce the problem?
1.enter the final door to Magnus Giganticus bossfight (in Mystical Garden)

What is the expected output? What do you see instead?
expected:begin of bossfight
instead:game crash with:
"BackPatch - no support for operand size 1"
immediately followed after this error message "Read from invalid memory
region (0x79edb2da)

What version of the product are you using? On what operating system?
tried several SVNs from old to newest.Without DC,JIT,IL and with.Both
x86/x64 My OS: Vista 64bit.GFX Nvidia 8800GTS512

Please provide any additional information below.
I included my Memory Card.It's save state Nr.2.Just walk in the pacman like
labyrinth (to the left hand side from the save point flower) and there
chose the door which had golden barricades (in former save states)