this is the complete output after launching the toolkit via terminal & pointing directly to the program within the .app container: <machinename>:~ <user.directory>$ Downloads/RocksmithCustomSongToolkit.app/Contents/MacOS/RocksmithCustomSongToolkit Current Mono version: v4.2.0 exception inside UnhandledException handler: The type initializer for 'System.Windows.Forms.WindowsFormsSynchronizationContext' threw an exception. [ERROR] FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: The type initializer for 'System.Windows.Forms.WindowsFormsSynchronizationContext' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Windows.Forms.ThemeEngine' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Windows.Forms.ThemeWin32Classic' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Drawing.KnownColors' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Drawing.GDIPlus' threw an exception. ---> System.DllNotFoundException: libgdiplus.dylib at (wrapper managed-to-native) System.Drawing.GDIPlus:GdiplusStartup (ulong&,System.Drawing.GdiplusStartupInput&,System.Drawing.GdiplusStartupOutput&) at System.Drawing.GDIPlus..cctor () in <filename unknown>:line 0 --- End of inner exception stack trace --- at System.Drawing.KnownColors..cctor () in <filename unknown>:line 0 --- End of inner exception stack trace --- at System.Drawing.Color.get_Black () in <filename unknown>:line 0 at System.Windows.Forms.ThemeWin32Classic..cctor () in <filename unknown>:line 0 --- End of inner exception stack trace --- at System.Windows.Forms.ThemeVisualStyles..ctor () in <filename unknown>:line 0 at System.Windows.Forms.ThemeEngine..cctor () in <filename unknown>:line 0 --- End of inner exception stack trace --- at System.Windows.Forms.SystemInformation.get_MenuAccessKeysUnderlined () in <filename unknown>:line 0 at System.Windows.Forms.Control..ctor () in <filename unknown>:line 0 at (wrapper remoting-invoke-with-check) System.Windows.Forms.Control:.ctor () at System.Windows.Forms.WindowsFormsSynchronizationContext..cctor () in <filename unknown>:line 0 --- End of inner exception stack trace --- at System.Windows.Forms.WindowsFormsSynchronizationContext.get_AutoInstall () in <filename unknown>:line 0 at System.Windows.Forms.Control..ctor () in <filename unknown>:line 0 at System.Windows.Forms.ScrollableControl..ctor () in <filename unknown>:line 0 at System.Windows.Forms.ContainerControl..ctor () in <filename unknown>:line 0 at System.Windows.Forms.Form..ctor () in <filename unknown>:line 0 at System.Windows.Forms.MessageBox+MessageBoxForm..ctor (IWin32Window owner, System.String text, System.String caption, MessageBoxButtons buttons, MessageBoxIcon icon, Boolean displayHelpButton) in <filename unknown>:line 0 at System.Windows.Forms.MessageBox+MessageBoxForm..ctor (IWin32Window owner, System.String text, System.String caption, MessageBoxButtons buttons, MessageBoxIcon icon) in <filename unknown>:line 0 at (wrapper remoting-invoke-with-check) System.Windows.Forms.MessageBox+MessageBoxForm:.ctor (System.Windows.Forms.IWin32Window,string,string,System.Windows.Forms.MessageBoxButtons,System.Windows.Forms.MessageBoxIcon) at System.Windows.Forms.MessageBox.Show (System.String text, System.String caption) in <filename unknown>:line 0 at RocksmithToolkitGUI.Program+<>c.<Main>b__1_0 (System.Object s, System.UnhandledExceptionEventArgs e) in <filename unknown>:line 0