PUT to a Directory fails

[Jeff Ramsdale]

I'm using GWT and Restlet 1.1-SNAPSHOT. My server provides a Directory, 
from which I can GET a text file and display it in an editable TextArea 
in the browser. I have a button that should PUT the modified contents 
back to the server but the PUT fails on the server with:

        WARNING: Unable to delete the existing file
This comes from line 828 in FileClientHelper. In line 780 tmp.exists() 
is true, but file.delete() returns false. Since this goes into native 
code I'm unable to determine why the delete fails.

I've done setModifiable(true) on my Directory. Any pointers on why this 
might be failing?

Thanks,

-jeff