#009316: Image rename failed by using ImageMagick

We are using clustered DB.
After removing the var/storage directory the temporary image files are created well, but PHP can't rename them for converting via ImageMagick.
ImageMagick is installed correctly and works.
ImageMagick version: ImageMagick 6.3.0 10/14/06 Q16
We need ImageMagick for images with better quality. By using GD this error does also occure, but the image is visible.

Debug output:
Warning: PHP Nov 01 2006 13:09:55

rename(var/storage/images/media/images/tulips/1583-1-eng-GB/tulips.jpg4748tmp,var/storage/images/media/images/tulips/1583-1-eng-GB/tulips.jpg): File exists in C:\workspace\est\kernel\classes\clusterfilehandlers\dbbackends\mysql.php on line 363

Warning: eZImageShellHandler::convert Nov 01 2006 13:09:55

Failed executing: convertim.exe "-quality" "100" "-geometry" "600x600>" "var/storage/images/media/images/tulips/1583-1-eng-GB/tulips.jpg" "JPEG:var/storage/images/media/images/tulips/1583-1-eng-GB/tulips_reference.jpg", Error: , Return: 1

Operating System: Windows XP x64
PHP Version: 4.4.2
Database and version: 3.23.49

- Setup a clustered DB instance
- Setup ImageMagick for proper use with eZ
- Upload an image via admin interface
- remove the var/storage directory and try to access the image
or try to access the image from a different PC