Ahh I see. I never had any symbols pop up for me, though I did see squares where I assume the dice went. Not sure if it's a bug or if I was doing something wrong. It does seem like a cool deck buildery idea.
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The way the dice work is you draw circles around enemies, chests, or yourself. You can draw up to 3 circles to spawn 3 dice, and when you let go of left click the dice are rolled (you'll see them spinning). A second later it will show the symbols you rolled on the dice. If you were doing all that and the symbols didn't show up, then it's a bug.
I think I found the problem. You have to draw the circles clockwise . If you draw them counter-clockwise in version 1.0.3 it breaks the dice. If you're using the original version then it won't break the dice, it just won't roll them. Thanks for all the feedback :) I put out a new version to fix this.