Yes, I have no opened up an unpaid item dispute but it is so frustrating as now I have to wait it out before I can relist the item!  It is not at all fair to those buyers who have bid on the item and genuinely want to pay for it. 

I havent had a look at the blocking feature but surely I will need to know who to block in order to block them which means they will have had to not pay me before or am I wrong? Is it a block for people who have payment strikes?