This one makes me even madder than most.
Be aware that there can be snafus with the pay processing. If you can, plan for it and try to put some money aside so there is something to fall back on in case they do "misfile" your paperwork.
I would not say this is common, but it can happen. If you don't get paid when you are supposed to, make sure you take action. Call DFAS immediately if you are unsure. If the problem is not identified, it can delay the processing even longer.