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I think that this problem is related Netbeans platform, but I tested in only with Tools -> Options Dialog. I have two monitors side by side in the work and two monitors in above position at the home. When I move Preference dialog do second monitor at home and then open it at work I can't see this dialog because it's open on non existing location. I must delete this wile config\Preferences\org\netbeans\modules\projectuiapi.properties and run NB again to work with preference Dialog should be test if saved coordinated exist before open. I don't know that this problem is related only to windows or another OS. I tested it in NB 6.8 and 6.9 too.
i've fixed the Options window in core-main 42c417481b7a if there are other misbehaving dialogs, please file separate issues, thanks
*** Bug 190757 has been marked as a duplicate of this bug. ***
Integrated into 'main-golden' Changeset: http://hg.netbeans.org/main-golden/rev/42c417481b7a User: S. Aubrecht <saubrecht@netbeans.org> Log: #182083 - don't use previous dialog bounds if screen configuration has changed
*** Bug 190341 has been marked as a duplicate of this bug. ***
*** Bug 187820 has been marked as a duplicate of this bug. ***