Thanks Steve!
I will check those suggestions on my machine. What surprised me with this is that it did a perfectly straight line before and only began this when I put new thread on the bobbin and then began sewing the two layers of PV and the interfacing. Maybe I need to consider a new, heavier needle, the tension of the foot, and the threading of the bobbin through the bobbin holder..the manual's picture for this is useless and this is not like the bobbin feed I have seen before. The instructions say to pull the thread into a notch and then draw it under the tension spring and into slot, but the diagrams are virtually useless. On the other hand, it is working so maybe just some minor adjustments.
By the way, a nice article in the Toronto Sun.
Clarence Walker