Error renaming temp file

[walker]

I am running VVPro 2.5 on 64-bit Windows 7 Pro. I am sporadically getting errors saying

Error renaming temp file
C:\Users\.....\myfile.cr2 Unable to rename C:\Users\....\~vv1.tmp into C:\Users\....\myfile.cr2. The process cannot access the file because it is in use by another process.

The files are not in use. I can copy them manually with Explorer. I am using Synchronization.

If I rerun the synchronization, these files are copied but others get the error.

I am having to synchronize many time to get a complete synch. The file set has over 100,000 files, so this takes a very long time.

[Guest]

One other important piece of information: the destination file is not is use. These errors are occurring while copying files to an empty directory.