Loss of Firewire connection to media device...QT problem?

I just did an auto-update and something happened with FCP...I am running on the following:
FCP 4.5
QT 7.0.3 (I think it just updated...could this be the problem?)
OSX 10.3.9
Here's what happened. When I get into FCP I get that message that there is no device connected. Well, there IS one connected via a Lacie external into my deck and out to my monitor. So, the short is, I can't see my video on the monitor. For some reason FCP isn't seeing the connection between the Lacie and my deck.
Any help would be GREATLY appreciated!!!
Mark

When you are changing the configuration (unplugging drives, etc) you ARE shutting down and rebooting the machine? In some cases, FCP will not recoginze Firewire devices that where not on when the OS first started.
Some users have reported problems with QT 7.0.3 and have had success reverting to QT 7.0.1
Other than that, try the delete receipts, download and reinstall QT 7.0.3 again. Sometimes it does not work the first go though. Also be sure to repair permissions after any software install.
re: new user account.
Go to System Preferences> Accounts
In the lower left you'll see a PLUS symbol. Click on it and create a new user account. give it a name/password and administrative rights.
Quit out of everything, log off and log back in using your new account. Launch and run FCP.
If things work, you have corrupt user preferences. Run FCP Rescue.
If things still don't work, you have a system wide problem. go back to your regular user account.
cheers,
x

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