Hi,
same problem here. First I noticed the repository URL had switched, so I used the –relocate option to relocate the 2.7.1 tag.
$ svn sw --relocate http://svn.automattic.com/wordpress/tags/2.7.1 http://core.svn.wordpress.org/tags/2.7.1
This seemed to worked fine. I then did the switch to the 2.8 tag using
$ svn sw http://core.svn.wordpress.org/tags/2.8/ .
which also worked. But then when accessing the site I got the folllowing error:
Parse error: syntax error, unexpected T_SL in /[webserver-path]/wp-load.php on line 49
I then used the version from the zip file which works but still gives me the message that I should upgrade to 2.8 although version number shows 2.8 (has already been discussed in other threads).
I’d really like to continue using SVN though. For now it’s good to know I’m not the only one with subversion problems here.