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I've recently upgraded to Java 7 (early access build 77) to get around an annotation bug in Java 6. I've noticed a lot of random UI errors. Sometimes when you double click on a java file in the project window, when it opens in the main editor you will only see a blank grey pane. Switching between tabs will often restore the display. Right clicking in the text editor to open the popup menu will also randomly fail, presenting a popup window with a single empty entry. I can't find any reliable way to replicate this behavior, but it happens several times during the course of a regular programming session.
Reassigning.
Closing now. Please reopen with more information if you see problems in recent jdk7 builds. Thanks.