AH – if you put spaces into the comments, as suggested by the RockeR, then I think all that does is turn the mcfunc comments into normal comments (i.e. stops wp-cache parsing them at all).
However, I’ve just managed to get this working, and it seems the solution (for me) was to make sure the functions I was calling are loaded BEFORE wp-cache, which I achieved by moving them to the bottom of this file:
/wp-content/advanced-cache.php
Cheers
