I have never had a security problem with nashbar, but I always use my secure log in.
I'm sure user error is correct.

When I placed the stuff in my cart and went to checkout, I entered all of my information and really thought I was creating an account. I didn't realize I was logged into someone else's. I had no idea something like this was possible.

I certainly will pay better attention from now on.

Nashbar was great about it and told me several times to watch my credit card and if any balance other than the balance she gave me today was charged to my card, to call them back.