Last night I completed this drawing of some melons using Infinite Design. When I exported it to a png file I realized some parts of the drawing near the bottom were not rendering properly. After fiddling with it awhile I discovered the opacity settings on two of the layers appear to be causing the problem. So I spent an hour on a workaround that now shows everything as it should be.
I ended up setting the opacity of the two layers in question to 100%. I then duplicated one of the layers and removed parts of both of them to get the desired effect I had tried using opacity settings.
Parts of the shadow and light colored stripes over the background are missing in the exported png file. I believe this is because the two layers these elements are on have lower opacity settings.
I spent a little over an hour fixing it so the missing elements now appear in the final exported png file.