I have two views that have views_calc SUM operations. They both perform as expected when logged in as admin, but send mysqld careening out of control when accessed by a non-admin user with what appear to be appropriate privileges.

There are relationships in the view, but - again- all is well when run as admin user.

I don't see any errors logged of any sort (at least, not until mysqld consumes all available resources and brings the site to a halt).

Not sure how to qulify this, and any thoughts about where to look or what to look for would be appreciated.