I am after some suggestions about what might have gone wrong here.

We have a Japanese student staying at our house, so as a good host I decided to switch the preferred language in my laptop over to Japanese via the international preferences pane. After logging out and back in things went a bit queer.

The finder never really reloaded, and although some apps had Japanese characters in the menus I couldn't get a finder window open to work in. Worse, was that although the System Preferences would launch (with Japanese menus) it wouldn't draw any windows. Which meant I couldn't change back. I couldn't do lots of things, including draw any finder windows or any see windows of Apps which had Japanese menus. What I could do was restart with the option key down and boot from my external drive and clone yesterday's backup onto my laptop drive.

I'd like to try this again but I'm afraid that I don't really like waiting for the 1 hour 47 minutes SuperDuper takes to restore my hard drive

Suggestions please

Hardware Overview:
  Machine Model:        PowerBook G4
  CPU Type:     PowerPC G4  (2.1)
  Number Of CPUs:       1
  CPU Speed:    550 MHz
  L2 Cache (per CPU):   256 KB
  Memory:       768 MB
  Bus Speed:    100 MHz
  Boot ROM Version:     4.2.9f1
  Serial Number:        QT1464GUKVF
  Sales Order Number:   M8362LL/A

System Software Overview:
  System Version:       Mac OS X 10.3.9 (7W98)
  Kernel Version:       Darwin 7.9.0
  Boot Volume:  Eric
  Computer Name:        xxxxxxxxx
  User Name:    xxxxxxxxx