QB2006 - Just discovered.
When a proposed check number appears, as in "Print Check nnnn," the number is often wrong -- I don't know why, but it is.
QB, no doubt realizing that the check number proffered is probably not the one you want, helpfully highlights the number so you can supply the correct one.
Instead of typing the new number, tape the (+/=) key and the highlighted check number increments by one!
Weird. Useful..., but weird.