C# => EnumJobHistory() not working on SQL-Server 2008 SP1 (10.00.2531) with smo-dll 11.0.0.0 and 10.0.0.0

Hi there, i am having problems enumerating the jobhistory for SQL-Server 2008 SP1 (10.00.2531). On SQL-Server 2008 R2 and 2012, everything works fine, and the function returns a DataTable-Object. Connected to SQL-Server 2008 SP1, the function call "