Please see attched image file. 
Mnemonic Keys which was mistaken on the Japanese
is attached.

To reproduce:
1.Tools -> Update Center...
2.Select "Install Manually Downloaded Modules" ->
Next
3. STEP2. Select Modules to Install(Continued)
The Mnemonic Keys of "Modules to Install"

Would you check if the first character is not used
as mnemonic key?
By localization, the first character becomes
no-ascii character. As a
result, the mnemonic key doesn't work by
localization. To fix this
problem, we need to set two resource bundle
messages, one is for 
caption, another is for mnemonic.
  Example=TestString
  Example_Mnemonic=T

And we should use like this:
myButton.setText(myBundle.getString("Example"));
myButton.setMnemonic(myBundle.getString("Example_Mnemonic").charAt(0).

The following line does not work with localized
version, because the
first character is not an alphanumeric because
it's replaced to
multi-byte Japanese character.

OS:Solaris 5.9  
Orion Build:orion_ml_020507  fcc Build:20.4
JDK:JDK1.4.0
locale:ja