Problem in "Edit Shop" mode: Thumbnails for listings not loading consistently

[CookedGlassCreations]

Is anybody else having this problem. When I am in "Edit Shop" mode to rearrange my listings, some of the photos don't load properly.  When I exit out and try again, other photos won't load.  It is inconsistent, and I can't get all of my listings to load up.  It makes it hard to rearrange the listings if I can't see them!

[ArtDollsbyJD]

I just tried mine and there are blank spaces but nothing is missing.  If you look at the numbers in the right hand corner they are all in sequence with nothing missing. I just did a little rearrange with no problem.  I ignored the blank spaces.

[CookedGlassCreations]

Everything is there, it's just that the thumbnails don't load up.  I arrange my shop by color and in a particular order, and it just makes it more difficult when I see just a colored square rather than the photo of the item.