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It happens when is opened a project. It is not easy reproducable. Follow steps in IDE Validation suite at http://qa.netbeans.org/man-suites/validation/ide/OverallValidation.html and it happens after 19.1 step. Following messages are printed out: [WinSys] Serializing component is invalid: org.netbeans.modules.java.JavaEditor$JavaEditorComponent[Plain [Up-to-date; 1.30],2,2,627x680,invalid,layout=java.awt.BorderLayout,alignmentX=null,alignmentY=null,border=,flags=0,maximumSize=,minimumSize=,preferredSize=] [WinSys] Serializing component is invalid: org.netbeans.modules.java.JavaEditor$JavaEditorComponent[Plain [Up-to-date; 1.30],2,2,627x680,invalid,layout=java.awt.BorderLayout,alignmentX=null,alignmentY=null,border=,flags=0,maximumSize=,minimumSize=,preferredSize=] [WinSys] Serializing component is invalid: org.netbeans.modules.java.JavaEditor$JavaEditorComponent[Plain [Up-to-date; 1.30],2,2,627x680,invalid,layout=java.awt.BorderLayout,alignmentX=null,alignmentY=null,border=,flags=0,maximumSize=,minimumSize=,preferredSize=]
Created attachment 8219 [details] IDE log
Created attachment 8220 [details] IDE log
Created attachment 8221 [details] IDE log
Created attachment 8222 [details] IDE log
Created attachment 8223 [details] IDE log
Created attachment 8224 [details] IDE log
Created attachment 8225 [details] IDE log
Created attachment 8226 [details] IDE log
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Created attachment 8231 [details] IDE log
I have changed version from 4.0 dev to S1S 4.2 (Nevada).
Peter please refine [WinSys] messages. It is not clear where it comes from. I suggest to add something like [WinSys-PersistenceManager.lookupTCInstance.1] to be able to identify where does message come from.
*** This issue has been marked as a duplicate of 29603 ***
OK.