ScummVM 0.11.0svn (Jun 18 2007 10:09:04) (the latest Win32 build)
It's the english/floppy/dos version
When you click on Elvira and then "mix", you are supposed to drag and drop the ingredients from the right page to the left to use them, but they are not displayed on the pages of the book (you can drag and drop them, but you can't see them).
I attached a savegame which can be restored by the name "mixing".
save game ("mixing")
Logged In: YES
user_id=34715
Originator: NO
The ingredients in the spell book were been shown, but quickly drawn over. The problem was caused by the code for clearing the effects of fire wall and ice walls always been enabled.
Fixed in ScummVM 0.11.0svn, use the current Windows snapshot.