I'm kinda curious if the solution is the same for everyone else: Walk away. I leave the programme alone for as long as possible (And, generally, depending on how nasty the code is, the longer I avoid the issue) and when I return, I return afresh. I run the programme. I get the error. I do a little debugging, and bam. There it is. Hello, its Mr Wildly-Stupid-Muck-Up.

I would assume that is an approach that appears quite often amongst those here. It makes sense-you get handed a problem, many times with someone breathing down your neck for a solution. Like a battlefield commander, you look at the problem opposing you, skirmish along its lines in attempts to find where best to hit it, form your battle plan, attack with all your forces... and your attack fails. You regroup your forces, and charge it again... and again... and again. You continue to attack along the same lines, until your attacks form muddy ruts in which you get stuck, attacking the same point over and over. Then you withdraw-the cost has been too high for little to no ground gained. You regroup, refresh, focus on other things for a bit, possibly even get new intelligence about your foe and its actions. When you return to that problem, you now come to it with a fresh view, and seeing it anew, you spot a better target point, or think of a better attack plan, and execute it, winning the day.

(Yes, do it all the time.)