no those lines are in the exported texture sheet from c2 its not that. It looks like it defaults to add x padding between frames
Heres the exported sheet right here you can clearly see the gaps between each frame. If it was the sampling itd happen even in preview. It doesnt
<img src="https://dl.dropbox.com/u/53012532/ImageExportIssueExample/images/sprite2-sheet0.png" border="0" />