We feel your pain!
Anyone who has spent any time at all working on (with) computers (and surely that's most folk these days - most
tech folk, anyway) has experienced that sort of thing.
Over the years I myself have spent many
thousands of hours hacking away at the keyboard(s), and for some years now have used two old machines linked together, "developing" on one, whilst trying to preserve the other in pristine condition.
And then, when all is well (hopefully), tested
etc. ... then I copy it all across.
But when you're tired, or in a rush (up against a deadline, whatever), or when someone is belly-aching at you, it's dead easy to screw up. A moment's inattention is all it takes. Stuff like that is another reason why I prefer to work alone, hidden quietly away somewhere ... and often at night!
