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The icon used for the classes button in the debugger window looks like this: http://ui.netbeans.org/docs/hi/debugger3.4/icons/nb33/loadedClasses.gif but should look like: http://ui.netbeans.org/docs/hi/debugger3.4/icons/nb33/class.gif
Your link: http://ui.netbeans.org/docs/hi/debugger3.4/icons/nb33/class.gif is broken, so I am not sure If I choose a good one. fixed in main trunk
The link sure was the wrong one! But, from the commit notice, it looks like you used the right icon!
Verified in trunk
Resolved for 3.3.x or earlier, no new info since then -> closing.
*** Bug 238620 has been marked as a duplicate of this bug. ***