So, I'm sewing cloth diapers. Serging the edges to finish them all together. I've done this before, but my serger is acting weird. I'm doing 4 thread, I've got wolly nylon in the loopers, and regular serger thread in the needles. Tension looks great, everything is working fine, EXCEPT, every few inches, the upper looper thread doesn't get "caught" on the left needle thread... So it ends up looking like a 3-thread overlock with the left needle thread just a plain stitch and a gap between... And it doesn't matter how fast or slow I go, whether or not it is a curve... <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/headscratch.gif" style="border:0px solid;" title="headscratch">: It's not completely consistant (like skipping every 2 inches)- it just skips randomly. I mean, they will still <i>work</i>, and I'm probably the only one that is going to notice <img alt="" class="inlineimg" src="/img/vbsmilies/smilies/eyesroll.gif" style="border:0px solid;" title="roll"> and there is no way I'm going to scrap them because of it, but what in the world is going on???