Wonder if it's connected to this issue?
For More Information see: FileMaker Go
This is one of many acknowledged bugs that can be found in the Known Buglist for Filemaker GO thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: http://www.4shared.com/file/8orL8apk/FMP_Bugs.html
exact same issue. didn't see this report.