Clicking on the download font button in the right upper corner kills the appplication.
I cannot reproduce this with r30218 on Mac OS X 10.5.2.
I cannot confirm the bug as well. Tested on Mac OS X and also on Windows.
I also cannot reproduce. Could you please attach a full crash log? See <http://webkit.org/quality/crashlogs.html> for information how to get one.
Per comment #1, comment #2, comment #3 marked as worksforme. sylvia, feel free to reopen the crash still happens to you but please remember to attach crash log as requested in comment #3