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Where an plugin update is detected the install over you the option to restart the IDE. This shuts down the IDE but it is not loading up again. I have noticed this twice now since upgrading to NetBeans 7.2. I am running on windows 7 with admin writes. The installation is default apart form the location. I use JDK 1.7 and also have NetBeans 6.5.1 running (but on different projects). For me personally this is a very low priority bug.
*** This bug has been marked as a duplicate of bug 207579 ***