@samuel: can you access the files in @music2myear’s post (on your site)?
I’m not sure why these files are restricted from your web server, but that appears to be what’s causing the problem.
Can you try downloading a clean copy of Jetpack and copy over those files perhaps? 0644 should be fine to at least allow your webserver to read them, unless you have some additional security in place perhaps which is blocking access to files with “admin” in the name or something like that?
My permissions look like this:
[minelava]$ pwd
/home/beaul/domain.com/wp-content/plugins/jetpack/modules/sharedaddy
[minelava]$ ls -alFh
total 236K
drwxr-xr-x 3 beaul pg114338 4.0K 2011-12-05 16:10 ./
drwxr-xr-x 6 beaul pg114338 4.0K 2011-12-05 16:10 ../
-rw-r--r-- 1 beaul pg114338 7.6K 2011-12-05 16:10 admin-sharing.css
-rw-r--r-- 1 beaul pg114338 12K 2011-12-05 16:10 admin-sharing.js
drwxr-xr-x 2 beaul pg114338 4.0K 2011-12-05 16:10 images/
-rw-r--r-- 1 beaul pg114338 3.8K 2011-12-05 16:10 readme.txt
-rw-r--r-- 1 beaul pg114338 58K 2011-12-05 16:10 screenshot-1.jpg
-rw-r--r-- 1 beaul pg114338 27K 2011-12-05 16:10 screenshot-2.jpg
-rw-r--r-- 1 beaul pg114338 4.5K 2011-12-05 16:10 sharedaddy.php
-rw-r--r-- 1 beaul pg114338 7.1K 2011-12-05 16:10 sharedaddy.pot
-rw-r--r-- 1 beaul pg114338 16K 2011-12-05 16:10 sharing-service.php
-rw-r--r-- 1 beaul pg114338 33K 2011-12-05 16:10 sharing-sources.php
-rw-r--r-- 1 beaul pg114338 6.3K 2011-12-05 16:10 sharing.css
-rw-r--r-- 1 beaul pg114338 8.7K 2011-12-05 16:10 sharing.js
-rw-r--r-- 1 beaul pg114338 17K 2011-12-05 16:10 sharing.php