This sounds like it might be the same as this? https://answers.unrealengine.com/questions/67322/undefined.html
Compiled source, version 4.3.1
Clicking on any item on the menubar or toolbar has no effect besides tabbar alternatively changing to a lighter/darker color.
Sourcecontrol-inputfield however can be used.
This does not apply to a new created project.
No errors or warnings show up in the logfile beside:
[2014.09.01-17.53.14:127][ 0]LogOnline:Warning: No default platform service specified for OnlineSubsystem
[2014.09.01-17.53.14:308][ 0]LogTextLocalizationManager:Warning: The selected culture ‘de_DE’ is not available; falling back to ‘en’
[2014.09.01-17.53.18:533][ 0]LogModuleManager:Warning: ModuleManager: Unable to load module ‘AndroidRuntimeSettings’ because the file ‘’ was not found.
[2014.09.01-17.53.18:543][ 0]LogModuleManager:Warning: ModuleManager: Unable to load module ‘AndroidPlatformEditor’ because the file ‘’ was not found.
Yes, this is it. Thank you very much.