I'm sorry to hear about the difficulties you are experience. We just started noticing some issues with the responsiveness of the site and I suspect the behavior you are seeing as you attempt to use the "Bulk Relist" option is related. Our technical team is currently looking into the situation and we will get things under control as soon as possible.
I will keep you posted on this through this thread as additional information becomes available. We apologize for any inconveniences this may be causing.