Tileset Trying to Line up tile resources

[Rob Lannan]

This is some ground resources (Grass, Water, Ice, Dirt, Etc) I am working for my game, nothing as fancy as some of you make, as it was made from some picture, MV, and scraps, etc. Yet my issue is lines appear every once in while on tiles in MV. According to Pixelmator there 48 by 48 and centered with the rest of the tiles. Any Idea .... I keep moving left and right with no fix.

Dropbox of the Source file.

 

[Jodis]

Ok i looked at your file and found the problam all i had to do was zoom in. here is a screenshot of what i saw.


You have transparency on the tile

The other is off to the right by one pixel.

Zoom in close like i did and check all the tiles.
there is a 3rd one there also with a transparency problem it is the 2nd to the last row last col.