Hi Joe, after using the latest version 2.0.29, my WPF app runs fine on any windows version. The same app installed and running by Click-Once Crashes all day long but only in Windows 8.
You can see an image capture of the error message here: https://skydrive.live.com/redir?resid=2D1F299DEB45D4A3!1830&authkey=!ADoQdf-LuA86-7U
"Could not create SSL/TLS secure channel"
With previous version (earlier to 2.0.28) of LinqToTwitter, it was working fine. Did you change something that would cause this ?
You may play with the app here: www.sobees.com -> [install now] (just add a Twitter account)