I uploaded a file with missing decimal point of a magnitude and got a "The website encountered an unexpected error. Please try again later." page. After going back to the last page in the browser the real error message appeared.
Another bug I already described about one year ago is the not working "|" delim. This character had been allowed for many years and some of our BAV members are using it until today. But the current import script does not accept "|". I always have to replace it by ";".