I forgot that some projects are opened in IDE....
The deadlock occured when I deleted folders with opened projects externally.
Created attachment 44506 [details]
I'm not able to reproduce. Reassigning to Milos, for evaluation. Thanks
Checking in OpenProjectList.java;
/cvs/projects/projectui/src/org/netbeans/modules/project/ui/OpenProjectList.java,v <-- OpenProjectList.java
new revision: 1.71; previous revision: 1.70