That had been an issue with the earlier release of the ExampleFiles.zip. Loading the .out file into ForceGen resulted in a Java.ArrayListException. I have released a new version of the ExampleFiles.zip.
The displaying of Gromacs angle data has been fixed and is currently available from Version 0.4. Currently, the main code branch does not reflect this (dated 3 August 2017) as I am still getting to grips with SourceForge versioning control. Be assured, when a 0.5 release has been made available, the code release will also be upto date.
Fixed. New releae in V0.4
Gromacs angle missing from text screen
Gromacs angle entry is now printed to the dialog window.
Loading in a .log/.out file appears to freeze the software
Gromacs angle missing from text screen