Hopefully the last of the iOS5 problems are resolved now.
If the first version of 26point2 you ever tried was the iPad version at v1.0.18 you need to delete the app before downloading the update. The iOS5 update changed the way programs worked a little which resulted in an empty database getting created rather than copied. Of course the empty database contains no records or tables so when you try to add a marathon record (event) to the marathons table the program crashes.