We just updated to version 4.0.2, which has changes that may affect your website. We have removed all or most HTML validation errors, which required the addition/removal of HTML code. This might be a minor annoyance.
Worst case scenario is that the positioning of your flags and language box might be different than before the update.
We have also added functionality to reset settings when the plugin is de-activated. You will not lose any of your custom CSS changes or Google Analytics ID, although the other settings will reset.
We chose to do this in order to remove, and then update your options to the most current standards of the plugin.
We are sorry for the inconvenience.
Please post here in the forum if you need help, or if you experience issues.