I just upgraded to 3.0.2580.31 from 2.5 and noticed a possible problem. steps to reproduce:
1) file > new , choose 20 pix by 20 px (small image)
2) change your zoom sufficiently high to see, perhaps 600%
3) press s to select, draw a select region perhaps 10 x 2 (or 2 x 10)
4) press m to change to move/scale mode
at this point, recall that the "move" cursor looks like a black triangle and the "scale" cursor looks like a hand. Move your mouse around the image to find a hotspot that will allow you to move the image (i.e. where the cursor becomes a triangle). I cannot find one, the program only offers scale (rotate, etc). To move this area, you have to select a larger block.
next, press ctrl+A to select the entire image. Now move the mouse around and you'll find that the "move" hotspot appears about 4-6 pixels from the outer edge... so on a very small selection, it will never be available.
ideas
1) as the zoom increases, the hotspot aorund the nubs should *shrink*
2) maybe alt+left mouse is ALWAYS move regardless of how close to the sizing nubs the cursor is
BTW, paint.net is a really fantastic program.
