Sender: 3.0.3 ext3fs on Debian Etch i386 with gcc 4.1.2 glibc 2.3.6
Receiver: 3.0.3 ext3fs on Synology NAS RS407 (Linux 2.6.15 on ARM/Marvell 5281) with toolchain gcc 3.4.3 glibc 2.3.2 from http://download.synology.com/toolchain.

Directory to be backuped on remote rsync receiver (ARM) contains:
 - a file named cbFlood
 - a directory named cbFLood (capital "L"!)

ls -l /home/till/cbFlood
total 2656
-rwxr-xr-x 1 till users  144956 2007-07-23 17:14 cbFlood
drwxr-xr-x 2 till users    4096 2007-07-24 10:38 cbFLood
[...]

command line on sender:
rsync --archive --compress --delete --relative --password-file $PASSWD_FILE /home/till  $REMOTEDIR

recv_files: "/Mon/home/till/cbFlood/cbFlood" (in NetBackup) is a directory
rsync error: some files could not be transferred (code 23) at main.c(1040) [sender=3.0.3]

On the sender side only the directory cbFLood exists after backing up.

The same rsync backup to a i386 platform works without error.