Cannot checkin anymore ...

Somehow I must have hit a svn bug. There are files that cannot be checked
in, cannot be removed, and are sometimes shown as versioned and sometimes
shown as not versioned:

Somewhere in my local working copy I have a directory with several
subdirectories, of which two, let us call them dir1 and dir2, cause trouble:

svn status -u -v dir1/
M * 51 49 johann dir1/file1
      51 49 johann dir1

svn status -u -v dir2/
      56 56 johann dir2/file1
      56 56 johann dir2

svn ci projectmembers
# (nothing happens)

svn update
-> At revision 56

svn ci dir1
# shows: M index.html, after "continue" I get
# Sending dir1/file1
# Transmitting file data .svn: Commit failed (details follow):
# svn: Out of date: <fullpathto dir2/file1> in transaction '2g'

After some playing around, the error message changed and now I get on each
attempt to checkin files:

Transmitting file data ..........svn: Commit failed (details follow):
svn: Base checksum mismatch on '<fullpathto dir2/file1>':
   expected: a7794ed137fa069e859241e2fd803217
     actual: 31ac6cdbfecc12606acef924f5a59497

I have no idea how to correct that error and how to make my working copy
function again.

Oddly, if I check out the file at a different location and then do a
comparison of the checked out file and the one in my original working copy,
they are binary equal -- so what is SVN complainin about??

SVN is not really helpful in helping me here ... status shows everything is
ok, none of the commands seems to be able to recover this situation :(
Received on Wed Jun 6 10:18:38 2007