So I am running OS X 10.4.11 with AVID 5.7.5 newly installed and I launch the DONGLE manager with my 4.8 DONGLE attatched to upgrade but it just says "no dongle found" so I try another dongle, same thing, so I try my dongle in another AVID, ALL GOOD. The dongle works, the Manager does not. HELP!

From here:

Why do I get the message: "No dongle was found. Please connect a valid dongle to this computer to ensure proper operation."?

If you experience this on a Mac:

1. Make sure that the Date/Time on your system is set correctly.
2. If the Date/Time are not set correctly, you need to uninstall and then re-install the Avid  software again.
3. With the dongle connected, open Terminal and go to /System/Library/Extensions directory. Become super user and type in "kextload Sentinel.kext". This should force the kext to load. Type "kextstat" to see a list of running kexts and look for "com.rainbow.iokit.sentinel."
4. Restart the system.

Please check which Operating System is running on your Mac. If it is a higher evrsion than the supported version, please either downgrade the OS to the supported version or upgrade Xpress / Media Composer to a version that has been certified to run under that OS version. A common issue is that OS 10.4.10 or 10.4.11 is installed but a lower version than Xpress 5.7.5 or Media Composer 2.7.5 shall be installed. (As of 11/2007).

On an Intel based Mac, only 5.7 / 2.7 and above will recognize the dongle.

You are running 10.4.11. The latest supported OS for 5.7.5 is 10.4.10 according to the Version Matrix. Downgrade, then try again. Also verify that your date and time are set correctly.