Hi Ty, many thanks for replying. The error occurs on four preinstalled apps. The analogue clock, which says "Parameter x expected value from 1 to 1. Change the parameter to be in that range." The DMM6500 Intro app, "Parameter x  expected value from 1 to 2". The Fuse Info app,"Parameter x expected value from 1 to 1 and the Channel Grid app "Parameter x expected value from 1 to 3". All very puzzling as I don't know what parameter x is.