This weekend I've experimented with (a clean instal of) Alfresco 4.2d.
On first sight, it mostly looks to be working, but I encounter two problems with it:
1. No thumbnails are generated. Previews in the detail view work fine, thumbnails stay the default icons. Even after a restart of Alfresco and a hard-refresh of the page in Firefox. Because of this, for example the Gallery-view doesn't work at all.
2. After clicking on 'My Files' I get sent to what seems be (the root of) the Repository, only named 'My Files', instead of 'Repository'. I expect to be sent to "User Homes/Username". There actually is no folder for this user (admin), even though lazy creating isn't enabled.
Is this something others experience as well?