In reply to Ridge:
Had a similar problem with Runkeeper on my Iphone last week, although in this case it tells me I had run 19km wheras I had only done 10.
Seems like it didn't initialise properly, or was getting bad data, but the GPS trace was all over the place. To make matters worse it was my first 10K run.
Not sure if the problem lies with the phone or the app
Mind you with a time of 58 minutes for 19k I'm expecting a call from the GB selectors any time soon.