Yes, I did the straight stitch just fine. I didn't use it in the store but last night I was playing with it and was able to use th zig zag stitch just fine.
I'm assuming I must have changed something without realizing it but I did put it to what I think is the default. It will be quite a while till I learn all the different settings. I just thought maybe some might know by looking at those crooked looking stitches what the problem might be. I have also threaded and rethreaded it several times.