Maybe someone on the forums has some suggestions. This was posted on my blog.

I have a Husqvarna Viking Platinum 770. Lately the tension is terrible. It doesn't matter what needle, fabric or thread I use after sewing a seam I can take the bobbin thread and pull the stitching out like it was a chain stitch. I have tried to adjust the tension and it hasn't worked. Does anyone know how can I remedy this? The machine was serviced in the last year.

Thanks,

Sharon