Michael, thank you for taking the time to explain what I'm doing wrong here. I think I selected horizontal loops (like the one you red circled in the first image) and filleted them first and moved on to vertical edges next. Now I know that would cause the fillet engine to throw wtfyouidiot() exceptions. >.< I'll pay more attention to my fillet groupings from now on!

Thank you and OSTexo for helping me with this. Back to MoI fun now.