My embroidery machine is skipping stitches or not picking up bobbin. Is the hook timing off?

Not necessarily. Hook timing is one of the last things to check when encountering a stitching problem. Other possibilities would be:

Improper threading, the bobbin is low or has run out, or a lack of oil on either the sewing hook or the needle bars you want to make sure these setting in Frame are set to 10 for both A and B