I think somebody asked about this a week or so ago, although it might have been in a FB or Yahoo group.
At that time, I had not ever had this happen. I buy it in gallon refills, so have used the Citrus (green) one for a long time. Just started a new bottle of Caribbean (blue), and it did leave spots where I didn't iron immediately. A misting of water, followed by immediate ironing, removed it. I never prewash new fabric, but this time am cutting up thrifted shirts, so they were washed before pressing. It's got to be either the Caribbean scent or something in the detergent (Tide HE, original scent).
I like both of these scents, but guess I will only buy Citrus from now on. Of course, having just opened a gallon fo the Caribbean, i will be using it for a while before I need to buy again.