Solution : https://service.sap.com/sap/support/notes/638128 (SAP Service marketplace login required)
Key words : 
actively occupied saving offline redolog files, newly created offline redolog files, offline redolog files, terms br tools, resume brarchive processing, problem occurs, saved immediately, remains hanging, program error -, downloading patches
Related Notes : 
       
| 514205 | Corrections in BR*Tools version 6.20 | 
| 403706 | Corrections in BR*Tools Version 6.10 |