I've just upgraded to 2.7 WP and your latest Next Gen version 1.0.2.
In the past I've used the sidebar widget to produce 8 thumbnails of random photos from my galleries. I did not want them constrained to a set side due to abnormal stretching of the thumbnails. So, I use to use a size of width 0 and height 0. This worked in past giving me different sized thumbnails but properly sized ones.
Now, I try 0 x 0 in the gallery widget settings but it produces little grey boxes and no images (I assume the 0 x 0 setting is making them very small to see now).
How do I get round this? Ideally, u need a new tick box in the widget settings saying:
Do not Resize thumbnails [ ]
But how do I fix this for now because the re-sized thumbnails in my sidebar look aweful :-(