applying patch creates .bak files but deletes originals?

We've used TortoiseSVN frequently to create patch files and pass experimental changes around between developers, and it has worked well. Now, when I apply a .patch file generated by TortoiseSVN, backups (.bak's) of the originals are created but the originals disappear. Any idea what I might be doing wrong or what could be causing this?
 
Thanks,
Glenn
 
TortoiseSVN 1.5.5, Build 14361 - 32 Bit , 2008/10/24 18:06:34
Subversion 1.5.4,
apr 1.2.12
apr-utils 1.2.12
berkeley db 4.4.20
neon 0.28.3
OpenSSL 0.9.8i 15 Sep 2008
zlib 1.2.3

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Received on 2008-12-03 23:34:44 CET