SeaTea

​I started with (in first post) 'step one' and both original and mirror sites looked exactly the same, also after utf-8 update of mirror-site in 3.4.7. 

I did not expect all the template rebuilds etc. were needed, as this was a default 3.4.7 install with only a few posts in one forum and only 2 users.  So I followed your guide in the second part of the post, and now the problems seem to have disappeared.  I have a 'normal' start-page now and will start testing and learning before converting my main site.  Thanks for the hints and your guide !

​I seem to have the same problem ....  
Updating a working (test) install with one test forum, 2 users, and a small database on localhost via wamp.  Working on 3.4.7.  After converting and installing 4.0rc2 I end up with the same,  Also when clicking on the links, I get a 404....  Only ACP links seems to work, but only text.

Before testing with my 'normal' forum I like to test the upgrade process. As I can only have one test-install (which I use for my 'normal' board)  I am trying to make a localhost test setup with wamp.  Could this be the reason ?  Maybe I should try a locahost testinstall via linux on a vmware local installation ??  Or is there a bug in the upgrade from 3.4.7 to 4rc2 ?