I found the easiest way to check without having to go into revise mode is to look for a line of text down by the top of the shipping section that says: "XXX for each additional eligible item you buy from XXX!"

In my case, everything past the first item ships free - it's a really big difference for most of my orders, which are usually multiple item.

In case you have to do this, one thing I noticed in the bulk editor is that after you select the "fixed price discounts", you are asked to select a "shipping profile". I don't use that (and aw2k doesn't support them), so I selected the first "blank" in the pull-down. Suprisingly (and happily), it worked and turned the option "on" :-)

I also went thru a manual SYI to see if anything apparent has changed, and it all looked the same to me. Both of the shipping discounts (discounts and promotional) are toggled OFF by default. Far as I can tell, there's no way to change the "default" - you gotta click the box.