Normal
What you are describing happens because we not only track the filename of a movie, but also the serial number of the hardware the file is on. Primarily this is meant for optical media but I think there is a case for getting rid of the check for some types of network drives. This is something we need to think about a little bit though. There is an issue scheduled for 0.9 to deal with issues like what you are describing though, so we will definitely take a look at this and come up with some sort of solution.
