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Icons for frames are included in developer.jar archive and they are accessed through getResource and their URLs serialized. And I think that's the problem, because URL contains absolute path to developer.jar and is serialized. So after deserialization, if absolute path of developer.jar changes, icons are valid no more. So aswer to your question is: developer.jar Please, file a bug in bugzilla, and you can assign it directly to me, or to core. And please don't forget to mention build number and some descriptive text.
*** This bug has been marked as a duplicate of 8080 ***
Resolved for 3.4.x or earlier, no new info since then -> verified.
Resolved for 3.4.x or earlier, no new info since then -> closing.