When changing a key to a duplicated one, jabref warns and freeze. Actually it freezes so bad that I cannot even kill it with the gnome xkill applet, first time for me that xkill cannot kill a window in years! Have to use pkill java.
To reproduce:
change an existing entry to an existing key
System: jabref2.8beta on Ubuntu 10.04
A freeze is kind of a serious issue.
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same thing on windows 7 (jabref 2.8beta)
warning windows opens but button cannot be clicked nor can jabref be shut down other than killing it in task manager