I've been logging diet and exercise using a tracking program, and it was just so cute to see the vaguely bewildered sounding message about how based on all their calculations I was taking in fewer calories from diet and expending more in exercise, but had nevertheless gained weight.
I get so angry about this I want to break things, or worse. The only thing I can do is leave it alone, though, and try to pretend things will stabilize in the longer run. Past evidence implies that will be the case, especially if I stop focusing on details of the moment.
Damn it, though, I'd really like to give up the position of poster child for YMMV.