title: Subversion any pre lock hook causes unlock to fail
body: <p>I have installed VisualSVN Server on Windows XP. (Authentication method - Basic Windows authentication). I edited the <code>pre-lock.cmd</code> script and put a comment line, <code>REM do nothing</code>. </p>
  
  <p>Next I tried to get a lock on a file. Everything works great until this point!</p>
  
  <p>Then I try to release the lock and get the following error <code>Server sent unexpected return value (400 Bad Request) in response to UNLOCK</code>. </p>
  
  <p>Please note I do not have any pre/post unlock scripts in place. I am using the TortoiseSVN client. I have tried the lock/unlock routine without the pre-lock hook and it works fine.</p>
  
  <p>Any insight on why this must be happening will be helpful.</p>