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NB trunk build 200404211800, JDK1.4.2. There are (at least) four ways to go from a TODO to the corresponding source: 1. Double click on a TODO. 2. From pop-up menu on a TODO chose "Show Source". 3. Using the icon "Show Source" in the TODO Window. 4. Using "Next Error" (F12) action. In 200404211800 build ways 1 and 3 does not work (they simply beep).
Doubleclick seems to be everlasting...
Now it works for me.