I sewed a whole side of binding before I noticed THIS. From the top all seemed fine and the machine sound never changed.
Although this mess was on the bottom, my first thought was to reseat the bobbin. Then for good measure I cleaned the dust bunnies from under the needle plate. Gave it a try expecting the best, but it was the same tangled mess. What to do? Would changing the needle help? Wouldn’t hurt. But as I was doing that I noticed the thread had somehow escaped the take-up lever. Re-threaded top thread and all is A-OK again thank goodness. I hate it when the machine breaks just as a project is nearing a finish (more on THAT soon). And now I’ll know exactly what to do if this ever happens again!