I have had those types of days, where I read the wrong line and cut the wrong size strips, miss counted and cut either way to many pieces or way to few. tried to put together a block and found out that the pieces were going in the wrong direction.
1 Take a deep breath, and then take another one
2 go beat up on something, I live on an acreage so I usually grab the ax or chainsaw and take it out on some wood.
3 if you figured out what the problem is with the GO fabric cutter, good, make sure you don't keep doing what ever it is that makes them short to start.
4, if the 1/4 inch is off or a pain, figure out a different mark to sew from
or make your own 1/4 inch marks to follow. on my older brother I have been known to put tape down and or other things to mark my guide.
5 sewing and quilting are supposed to be fun, maybe make something that doesn't have the accuracy that quilting requires. something fun and easy.