Hi Radin. I presume you are using a shape layer to create this? I also imagine that the upper right corner is the first vertex? If so, the strokes appear at the first vertex and disappear when they reach the first vertex as well - they don't wrap around. So it's a balancing game between the length of the stroke and the distance it needs to travel so that it appears to be wrapping around the corner. I'm sure some mathematical wiz here could give you a formula but in this situation I've always just played with the length of the stroke or the size of the path until it looks right.