Solution : https://service.sap.com/sap/support/notes/660214 (SAP Service marketplace login required)
Key words : 
static context menu, internet transaction sever, toolbar control reason, toolbar opens, closes immediately, web server, patch level 5, patch level, higher patch, prerequisites
Related Notes : 
       
| 563161 | SAP GUI, SAP ITS & SAP IGS patches on Service Marketplace | 
| 335521 | ITS patch installation of kernel files | 
| 330793 | Downloading patches |