OK - dorsetmartin, the way you had posted I thought you had figured it out...You continue knitting with the same yarn, you do not cut it. What you will end up with is groups of six stitches on your needles, separated by open spaces.
(For those who don't know)After you cast on, you create the triangles by working short-row shaping (turning the work before the end of the row - it creates an extra row of stitches)over groups of six stitches. Then you actually knit in oppsite directions, by picking up stitches off the slanted sides of the triangles, which creates a basketweave pattern.
If you need any questions answered, feel free to PM me... I think I understand where you went wrong, but I'd like to see the directions that you're working from, if you have those. I got mine from here
and except for one minor mistake, they're very accurate.