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1. Install Netbeans 7.4beta on my Linux destkop (LinxMint 14) 2. start netbeans 3. Maxinum the main window 4. click any menu item. (e.g. file) The menu popped up but soon disappeared. This bug exists only on Linux platform.
Please provide more details. Which JDK? IDE log?
Created attachment 138845 [details] netbeans startup log
nothing interesting in log, seems to me like JDK problem: please install newest JDK (you are using very old one) http://www.oracle.com/technetwork/java/javase/downloads/index.html and reopen if you can still reproduce. Thanks in advance!