Joost just released today version 0.10.4 of their Mac and Windows beta clients. This is mainly a bug fix release and does not appear to include any major changes.
You can grab a copy of the new client over here.
If after the upgrade you find that the application doesn’t start up, or hangs at the splashscreen and it has run in the past then it is very likely that the user profile and.or the content cache has become corrupted. The solution is to delete the Joost Application Data directory.
On the Apple Macintosh this is simply done by holding the
On Windows enter %APPDATA% in an Explorer window address bar and then select the Joost directory and delete it.
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[...] Joost 0.10.4: la nouvelle version ne semble pas apporter des nouveautés, mais seulement des corrections. [source] [...]