[Plugin: NextGEN Gallery] Edit Thumb in Gallery breaking the Grid

I have the same thing. It seems that script that edits thumbnails works not accurate in some cases, for example, I have set thumbnail sizes to 150*100, but when I edited thumbnails, some of them became 150*99 and this is the reason of breaking the alignment.

I fixed this in that way:

.ngg-gallery-thumbnail {
	min-height: 109px;
}

You should calculate your own min-height value (in my case I have 100px height and top/bottom paddings and margins give the additional 9 pixels), but you can just detect the max height of your ngg-gallery-thumbnail with firerbug in Firerfox and so on.