One of my ad groups I created overnight came up this morning with "budget paused" (not the same as user paused). Then later, it un-"budget paused" itself. Why would it do this? I'm guessing they paused it because there was only 3 dollars left, and un-paused it when I upped the budget. That's the only thing I can think of.
duhhh... c'mon dude.. just joking mate.. yes you are spot on.. as you know if you set you budget to $100.. you will sometimes spend about $105 - $110 as it takes a couple of mins for the budget limit to filter through.