I bought a used CV last year and currently working on my first project on it, an embroidered quilt. The only problem like yours I have encountered, is when using the pre-would bobbins and they get down to half full, the top thread catches under somehow after changing thread colours, causing nesting. So I rewind what is left onto a plastic bobbin (becomes a full bobbin) and no more trouble. Still don't know if I really like the machine, but love, love, love the 'precise positioning' feature.