Memory exhausted on updating access control

Hi there,

I tried installing access control and it works fantastically, except that it exhausts my memory when trying to update all our user profiles at the same time.

The memory is already pushed pretty high at 64MB:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 43 bytes) in /home/maybeor/public_html/includes/module.inc on line 87

This is particularly a problem because we display a view of a user's buddies on their profile. However, those they became buddies with before a certain date won't show because it seems the access controls have not been updated that far or something. Is there any way of breaking down the rebuilding/updating of access controls into more than one flush?

thanks

thomas