clamscan can't process excluded-dir

Hello. Recently, clamscan stopped processing the '--exclude-dir' option. I'm using the Ubuntu LTS package (1.4.3) and cannot figure out what the issue might be. I run the same scan on two different computers, yet only one of them throws these errors. I have uninstalled/reinstalled clamav to no avail. I'm running as root and the directories do exist. Tried with and without quotes and with and without trailing slash for the excluded directory. I compared environments (printenv) and they are the same other than variables that change (PIDs, etc.).

From Konsole:
# clamscan -ir exclude-dir=/usr/bin/ /usr
exclude-dir=/usr/bin/: No such file or directory
WARNING: exclude-dir=/usr/bin/: Can't access file
^C

Has anyone experienced this and/or any idea of what else to troubleshoot?
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