I ran into this while doing a little testing (2 instances of maptool running on the same computer, one as GM, one as player).
As long as tokens with vision are in regions that aren't covered in LBL then the vision works fine. As soon as a token is moved into a space with LBL, instead of calculating what it can see and just revealing that, it reveals the entire map that has been explored so far. This reveals all monster tokens that aren't in line of sight.
I guess what is happening is that when it can't calculate vision, because the vision source is inside the light blocking layer, it defaults to revealing everything. Could the default behaviour be to reveal nothing?
This is with just one token, which I guess makes a difference from what I read before. However one misclick while moving a token could scupper a DMs best laid plans for a secret ambush.
Problem with Vision
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