Backtracking and circles

I have an Avante with ProStitcher with the Acer Tablet EEE PC Tablet.

When stitching out an E2E design, any backtracking does not backtrack over previous stitches - EVER.

When stitching out designs the machine seems jerky.

When stitching out circles in a design, they aren't pretty round circles.

What could be the cause of these issues?

Thank you, in advance, for any trouble shooting ideas!