How to Drive 1 Resource to Do 2 Simultaneous Tasks - Same Days, 50% Allocation to Each

John,

My (more complicated) setup looks similar to what you have above. Both activities have the same predecessor and are allocated at 50%, and the project has been updated and leveled. The sequence that is supposed to be concurrent (see screen shot) repeats a few times as we do the cycle of tasks repeatedly at multiple locations, but it seems only one instance of this has stacked up as concurrent - the rest are all going sequentially (sometimes task 1 goes first, sometimes task 2 first, not sure why either).

Let me know if the attached screenshots help at all.

EDIT: wouldnt let me attach the screenshot in the body for some reason so it's here as an attachment