The TimeFlowsEx sample application displays the About menu with the text "Print Preview" rather than "About..." or whatever that text should be. The menu is created like this:
mabout <- menuAbout mhelp [help := "Information about this demo."]
The event from the "Print Preview" menu does pop the proper dialog. So only the text is incorrect.
I am using wxWidgets 3.0.1 and the latest wxHaskell.