If you really have "le 7.3" installed and not 7.3.1 for 003/003 Rack, it won't work. You need to make sure you have installed Pro Tools LE 7.3.1 from the installation disk included with the 003 Rack. From the Compatibility link above:
Compatibility
Pro Tools LE for Mac OS X Compatibility
http://www.digidesign.com/index.cfm?...4&itemid=23639
Quote:
003 drivers required, included with Pro Tools LE 7.3.1 for 003 & 003 Rack
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