Yes you're both quite right, I shouldn't blame VueScan.
I wouldn't go near anything made by Canon after this. To make things even worse, when they tell you they don't support a driver for the scanner, they put 'why don't you go to our prodects page' so you can buy a shiny new piece of kit.
Whilst I'm here, anyone know of a decent flatbed scanner that can scan slides/film? Hopefully that won't upset the bank manager.