Cheat Engine

[Pokiaka]

First question: I've encountered in DMC5 a situation like this:

[Dark Byte]

1:
Post the bytes of that instruction here, but my guess is that the address you found isn't the correct one.
This often happens when doing a unknown initial value scan with a wrong type or alignment. In this case, it's of type "Float"

2:
Set a breakpoint and debug (perhaps add a jmp originalcode that you must manually nop after setting the breakpoin)

alternatively, you can use the Lua command sharedmem=allocateSharedMemory("name", size)
That returns an address in the game you can use to store debug information.

(And then in combination with registerSymbol("sharedmem", sharedmem) so aa scripts can use it.)

e.g:
mov [sharedmem], 1
..do stuff..
mov [sharedmem],2
..do stuff..

then when the game has crashed call allocateSharedMemory again (on any process you like) and in the new location you can see at which step it crashed

3: The instruction may be used by other addresses as well.
E.g, the decreasehealth() function might be used for both the player as an enemy

[Pokiaka]