Solution : https://service.sap.com/sap/support/notes/844383 (SAP Service marketplace login required)
Key words : 
dialog box remains empty, dialog box navigator, terms navigator, calendar control, popup_navigator reason, calandar controls, popup_navigator style, solution install, support packages, patch 19its 640
Related Notes : 
       
| 563161 | SAP GUI, SAP ITS & SAP IGS patches on Service Marketplace | 
| 335521 | ITS patch installation of kernel files | 
| 330793 | Downloading patches |