I am making a half drop repeating seamless pattern in Designer that I'm using lines with multiple overlapping gaussian blur effects applied. I always have problems with shadow effect matching up at the seams of the pattern, and was hoping to find some solutions. Matching up lines that cross a seam can be a challenge, but when I create a blur effect, it never matches on the other side of the seam. The has to be a method for using shadows and highlights that can be learned that works reasonably well, but I haven't seen found any instructions that deal with such that specific niche of using this program.
Here is a screen shot to show what I'm referring to-- you can see the seam where the tile doesn't match up with the blur effect, especially in the corner of the half drop.