I concur with your findings. Added Snipe and got the spinning wheel. Closed out, refreshed Current Snipes, and it did add it. Oddly, under eBay item # it has "in group undefined". I did not select the group option.
Before above... I was able to repeat the following issue every time: Click [Slam-it], click [Add Snipe], get spinning wheel, wait couple of second, close window, click [Slam-It] button again and click [Add Snipe], get message below the button that snipe has been added.
When the Slam-It window opens, the width/height is not wide enough for the new content, resulting in horizontal and vertical scroll bars.
Cheers,
John
bidslammer