The Vector menu no longer works. All the other menus drop down and show the different options available. Here is the error message shown upon startup. I do not know if this is linked to the Vector menu or if two different problems.
2019-03-24T14:06:40 WARNING Python error : Couldn't load plugin 'NITK_RS-GIS_17' due to an error when calling its classFactory() method See message log (Python Error) for more details. 2019-03-24T14:06:42 WARNING Plugin processing : The plugin will be disabled because it crashed QGIS during last startup. Please report an issue and re-enable the plugin when the problem has been solved.