If you've experienced either of these, well, you have my sympathies. They were both the source of many colorful words - mostly since they happened with a new machine.
When sewing PUL, I tried several different needles to alleviate the skipped stitches. Ball-point needles are a must. I'd get skipped stitches with an 80/12 needle, but when I switched to a 70/10, life was good.
For a little more information on proper needle choice - Threads Magazine has a few good articles:
Threads Magazine - Machine Needle Know-How
Threads Magazine - Sewing Machine Needles - An Overview
Bird's Nests were another issue. These are the loops of thread that build up underneath the fabric and just jam up the works. Typically, a bobbin that's popped out of place is the culprit. What happened with my new machine was that the needle thread was slipping off of the take-up lever (the arm that goes up and down along with the needle). This wasn't an issue with my older machines because the lever was out in the open. The new machine has the lever hidden behind the machine's plastic cover & it's just a hook - easy to thread, but nothing to hold the thread in place.
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