Thanks, Mika– you’re right, and I should have realized it. When we upgraded to 3.5 running get_blogs_of_user() started creating a a memory timeout for the SuperUser b/c that account was affiliated with so many blogs. We had a plugin written that strips blog capability keys for the superuser if belongs to more than 75 sites… we’ll have to figure our how to add it back for user management.
Odd… I’m certain I deactivated the plugin when looking for the bug, but, who knows. Sometimes going public with your struggles is the thing that lets you figure them out!
Marking as resolved–