I did have one problem when I found a knot in one of my warp threads. It was small enough that I got the loom warped without noticing it, but when I started to weave, the reed would not pass easily over the know and the thread became loose. I wasn't sure how to fix it as I'm not very good with warp repair. In a moment of extreme luck, I was able to cut the thread and repair it using the invisible join loop method that I used for crochet. The repair area will be slightly thicker, but I've already worked past it, and it is not visible in the final fabric.
I really like the way the fabric is turning out, and hope that I will be able to create a beautiful and useable tallit!