Hi, I’m not sure what could be causing this. The LinkedIn connection is working properly on the accounts I test it with.
If it’s still not working can you try logging in to LinkedIn and checking to see if there are any WordPress.com connections listed for your account? If so I’d recommend removing those and starting things from scratch.
I cleaned up the connections and did from scratch. Well, it doesn’t show any error message now but my posts still don’t go to LinkedIn. They show up in Facebook, Twitter, Yahoo! and Windows Live but not LinkedIn. Please check.