Everywhere I go on google I get the same answer to this problem but it is the wrong answer for me. Originally I installed Subversion 1.5.6 for windows (i run Windows Server 2008
In my case I moved eclipse code from one place to another then the problem started. For solving I checkout the project form the svn repo. Then in old project I cleaned all svn files. (simply search .svn and delete ) then I copy the content to the just checked out project, my changes became visible and my project is up to date. This method can be applied for other annoying errors. Hope this help someone