When the Mac langpack installer is launched, the window/dialog has no focus. You first have to click the icon in the dock to make the window visible at all.
Possibly because the Applescript that does the grunt work doesn't grab the focus.
From what I understand, including "activate" before the line "display dialog..." should bring it to the foreground.
Created attachment 41961 [details]
Modified Applescript to bring dialog to foreground
Enclosing modified applescript to bring installation dialog to foreground
Reviewed & approved the change for -3-3. Should be fixed.
Reopening because it appears the commit has been reverted in 3.3.1 RC2, as the script stays in the background once again, and the keyword "activate" has been removed (or the changes have been overwritten with the old source in the repo).
Seems to work for me on 10.6.6 with 3.3.1 RC2?
my bad for re-opening, had wrong langpack install set.