亲测可用~

Windows： %APPDATA%/syntevo/SmartGit/
OS X：    ~/Library/Preferences/SmartGit/
Unix/Linux：  ~/.smartgit/

and remove the file settings.xml

例如windows:

开始 运行 %APPDATA%/syntevo/SmartGit/  

就会自动找到路径删除settings.xml

重启就行了