Ashley Here's another capx, no events, just two identical black sprites, without any space between them, they had two different animations A1 and A2.
Open the capx, then export to node-webkit, open webkit project and resize the window until you see a line between the sprites or simply go fullscreen(maximize button). This offset appears on all sides of sprites, right, top, left, bottom.
Now open the capx again, edit the black sprite, delete A2 animation, export to node-webkit again, open webkit project, resize the window or go fullscreen(maximize button) and now there is absolutely no spaces between sprites, because sprite picture is now exported as a single black picture, not a spritesheet.
And another capx, that i guess explains the problem, the picture's edges becomes blurry in spritesheet? Here's 2 objects, Ground(Exports to spritesheet) and Ground2(Exports as single picture).
Preview it in editor, and see that 2 sprites are okay, now export to node-webkit(or anywhere else) and open the exe, look at the left sprite(Ground). The spritesheet reduces the edges quality, that's where this offset is coming from.