I like to work with a lot of novelty yarns. While they can be a great accent they can also be a great pain in the rear. They stick to other warps or have more elastic stretch to them. For most situations, my answer to the problem is to crank up the tension.
I recently had a weaving remind me that sometimes the answer is opposite to that. For yarns with long hair-like strands it's better to lower the tension as much as possible. Then the hairs slide past each other. If the tension is too high, they want to lock together and you feel like you are ripping the yarn apart each shed change.
For stretchy or short fiber yarns, I think the increased tension helps because the sheds will snap apart rather than being given leeway to tangle with each other.
Ya, I don't know how to explain it any better. I guess what I'm saying is if the yarn is giving you trouble, more tension isn't always the answer. It's a matter of trial and error, but you'll get the hang of it.
Lion brand Homespun - High tension
as high as you can, and then watch when you advance the warp that the fibers are not getting bunched up behind the heddles. This may not make sense now, but you'll get what I'm saying once you try to work with this yarn.
Boucle (pink) and JoAnn's Angel Hair (purple)
Once I got the tension right, this wove very smoothly. Before that, it was a bit frustrating. I think it's the boucle that's at fault. It seems to have a narrow window of preferred tension, but once you find it the rest of the project will fly.
Crinkle Knitting Yarn - Low Tension
I wish I knew the brand of the yellow acrylic in this band because it was awful to work with. I have never had an acrylic stick so much. Thankfully I don't seem to have anymore.
Lion brand Wool-Ease weaves like a dream. For this one I used higher tension to counter the bulk induced stickiness of the Thick and Quick (orange)
Red Heart Tiki is quite stretchy. Even under high tension, keep an eye on it. You can miss a warp or two for several rows. At low tension, it's just a tangled mess.