Originally Posted by mczolton
Hell, I'll do it. I don't care. I just didn't think is was necessary.
I see that this topic had a number of differing opinions, and/or information, not that long ago (e.g. Toshiba tech support indicating this was not necessary, and folks like Robert saying that we should do it). I just wanted to share my problem, as I thought it adds weight to the argument for doing an Initialize after an upgrade.
I upgraded my system when 1.3 came out (from 1.0), and threw something (I can't remember what) into the player afterward, just to ensure that it still seemed to work. Yesterday, I threw in my combo HD-DVD flavor of The Departed (which I also know was working fine, before the upgrade). It read the disk, and then simply displayed error 408b4203 on the player's display. I cycled power on the box, and that didn't help. Because it was relatively easy to do, I went ahead and Initialized the player back to its factory defaults, and then set everything back to where it needed to be (which took all of about 3 or 4 minutes, because I always write down my non-default modifications to any of my devices).
BOTTOM LINE. After the Initialize, the disk played flawlessly. Needless to say, my recommendation would be to follow Robert's advice, as it seems to be more informed than that of the folks at Tech Support (like that should surprise anyone who spends time in these forums!).