I came here to say that just now I saw for the first time my card grouping (I use Custom Grouping - which is just one heading, "Main") is displaying as a vertical bar labelled "Main" in the first row of cards when I go to the Visual Spoiler tab of a deck.
I don't like this. I tried to find a setting to hide it, and could not find one. Please make it go away, or give me a way to make it go away.
Despite this minor piece of negative feedback, I'd like to also say that this site has been very useful to me and I approve of it very much. Thanks to any who read this for taking the time to consider my feedback.
Later modification: I also notice now there are displays on Visual Spoiler of the number of copies of a card. I don't like this either. It may be somewhat useful on the number of basic land, but hover text was always good enough and much less obtrusive. As for the cards with 4 copies or less, the visual representation provided by the stack of cards has always been sufficient, and is a much more elegant way of presenting the information. These overlays on the Visual Spoiler tab are unwelcome. Thanks again.