No - it used to come up with a confirmation box before installing. I only use it on rare occations now, but our ops department reports better and better reliability now compared to a few years ago.
However, there are a few things that annoy me. When accepting a flightplan from the system, there often is a diff between the avg WC and the wind we can read from the windcharts - generated from the same pps flightplan! Furthermore, I'm not quite sure that pps always calculates enough fuel for the "longest" arrival.
Besides from that - I think the system is very easy to use and extremely reliable.