Solution : https://service.sap.com/sap/support/notes/824505 (SAP Service marketplace login required)
Key words : 
entire sap gui crashes, /whdc/devtools/debugging/default, sap gui support packages, sap gui session, sapphone status control, global interface table, debugging tools, support package 55, support package 10, support package 0
Related Notes : 
       
| 96885 | Downloading front end patches |