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If the machine supports multi-monitor and you start off with the secondary monitor disabled, then start up Netbeans, after the application is up, extend the desktop to the second monitor. Drag Netbeans to the second monitor, menu drop downs and pop ups still display in the primary window. To fix the issue, shutdown Netbeans and restart it.
Reassigning to "core" for evaluation.
It's JDK bug 6486066, not Netbeans related. Any java app will have this kind of error. Anyway thanks for the report.
*** Issue 136012 has been marked as a duplicate of this issue. ***
v/c