Bad embroidery stitch... why?

Have a question or want to show off your project? Post it! No Registration Necessary.  Now with pictures!

I have a Husqvarna Viking Iris 600, which I received as a gift 8 years ago.=
  I'm just beginning to really use it.

The ready-to-go embroidery cards, which I plug directly into my machine, se=
em to work fine, at least electronically.  But today when I tried out one o=
f the designs, the stitching started out fine but then started to get slopp=
y and the needle seemed to get stuck in one section of the fabric and would=
n't move on.  The tension and stitch length were all set to normal.  When I=
 took it off the machine, I noticed the fabric wasn't taut on the hoop.  It=
 seems it had loosened the fabric as it stitched.  How do you combat this?

And is there another fix I should look at?

Site Timeline