Checksum mismatch when commiting new binary files

I have a strange problem with my subversion environment:

When I try to commit a new binary file, I get a error message "Checksum
mismatch, ...".
When I repeat this attempt, the actual checksum changes sometimes.

Can anyone help me?
Regards
    Friedbert Widmann

Szenario:
DOS> svn info FILE.jpg
Path: FILE.jpg
Name: FILE.jpg
URL: http://SERVER/repos/PROJECT/trunk/DIR/FILE.jpg
Repository Root: http://SERVER/repos/PROJECT
Revision: 0
Node Kind: file
Schedule: add

DOS> svn commit -m "message" FILE.jpg
Adding (bin) FILE.jpg
Transmitting file data .svn: Commit failed (details follow):
svn: Checksum mismatch, file '/trunk/DIR/FILE.jpg':
   expected: 4801775b1895f98ea3c9a049364f8b31
     actual: c88881dfc4326dbe5460347f929035df

[... repeating commit ...]

DOS>svn commit -m "message" FILE.jpg
Adding (bin) FILE.jpg
Transmitting file data .svn: Commit failed (details follow):
svn: Checksum mismatch, file '/trunk/DIR/FILE.jpg':
   expected: 4801775b1895f98ea3c9a049364f8b31
     actual: c7b169d76e0baa3e369c1793b8f0e5c1

Environment:
SVN server:
- openSUSE 10.2 (kernel: 2.6.20-2)
- SVN: 1.4.0 (r21228)
- HTTP-protocol, Apache 2.2.4

SVN client:
- Windows XP SP3
- SVN: 1.5.4 (r33841)

-- 
  Friedbert Widmann               mailto:Friedbert.Widmann_at_gmx.de
  Wacholderweg 10                 phone: +49 (07073) 841004
  D-72119 Ammerbuch-Poltringen    fax:   +49 (07073) 302935
                                  mobile: +49 (0173) 3927199
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