Why do my grid lines disappear ?

Happens with dynamic lighting as my players move about the map, the grid lines just disappear, especially on the edges of the map, top and bottom. Ive notice this problem happening for a while now, but not with all my maps. 

Can you post some screen shots?

Hi Zapatilla Loca,  Is this on Jumpgate or Legacy Roll20?

And are you by chance on an HD/Retina monitor?

Hello All...so to answer some questions, I use a laptop, not sure what the resolution is. I am using jumpgate, and this doesnt happen with every map, mostly just the ones with dynamic lighting. I dont know how to take a screen shot sorry. I use the same resolution for all my maps, however it seems that the larger the map (pixel wise) the more likely the grid will disappear as my tokens move around. Zooming out, the grid is clearly visible, but once you zoom in, the grid starts to fade out.

keithcurtis said: And are you by chance on an HD/Retina monitor? If it is this type of issue -- Roll20 should check out the solution that Dungeonscrawl uses for this. On dungeonscrawl it's called the Roughness of the Line and you can set Rough 1, or 2, or 3. It just generates a little bit of waviness in the width of the grid-line so that it isn't strictly "1" or infinitely thin. The effect is really interesting how it makes the Grid show up better on ultra-sharp screen resolutions at varying zoom levels. It has the illusion of the grid looking slightly "hand drawn" and resembles Dyson Logos style maps. 

I'd rather they just fixed the display issue (assuming it even is an HD issue) than change how interface elements like the grid line look and feel.