I had the same issue but now I know what is the solution.
1- Have a copy of the script on your desktop
2- Open Crome
3- On the search/address bar just put this: chrome://extensions
4- Just move the file from desktop to just opened chrome window. (you'll see your other extensions here)
5- click yes/ok
so there was new version 0.43 released, that's why we needed to re-install the extension.