There is a naming mismatch when exporting the current visual studio settings: the exported shortcut is assigned to VisualAssist while the keyboard binding is named VAssistX.
On importing these settings errors occur, e.g.:
Error 2: Keyboard: The command 'VisualAssistX.RefactorChangeSignature' does not exist. The keyboard shortcut bound to this command has been ignored.
In the .vssettings file you can find:
<Shortcut Command="VisualAssistX.RefactorChangeSignature" Scope="Text Editor">Ctrl+R, Ctrl+C</Shortcut>
Instead it should read:
<Shortcut Command="VAssistX.RefactorChangeSignature" Scope="Text Editor">Ctrl+R, Ctrl+C</Shortcut>
<Shortcut Command="VisualAssist.RefactorChangeSignature" Scope="Text Editor">Ctrl+R, Ctrl+C</Shortcut>
Manual renaming of all these occurences in the file solved the import error messages.
Experienced with VisualStudio 2010/2013 with VA_X.dll file version 10.8.2029.0 built 2014.02.24