Automatic or manual export of toolbars settings exports all settings, not just toolbar related one. This causes problem when user changes anything in VS settings that it's overwritten on next VS startup.
Temporary workaround untill this is fixed: Goto C:\Users\xxx\AppData\Roaming\Microsoft\VisualStudio\11.0\NiceVSToolbarsBackup.vssettings, edit the file in your favorite XML editor.
Remove all <category> elements but /UserSettings/Category[@name='Environment_Group']/Category[@name='Environment_CommandBars']. Your settings file should look like attached one.</category>
Temporary workaround untill this is fixed: Goto C:\Users\xxx\AppData\Roaming\Microsoft\VisualStudio\11.0\NiceVSToolbarsBackup.vssettings, edit the file in your favorite XML editor.
Remove all <category> elements but /UserSettings/Category[@name='Environment_Group']/Category[@name='Environment_CommandBars']. Your settings file should look like attached one.</category>
It seems that this bug also causes Visual Studio Find and Replace dialog not to appear.