Created attachment 111426 [details]
20110929-99f6dbaa0c84. Created NB Platform App project and IDE hung during opening.
hmmm, the problem is that NbArtifactFixer will only only attempt to resolve project dependencies but also extensions and projects with extensions.
created a component inheriting from the DefaultPluginDependenciesResolver that mutes the WorkspaceReader and associated ArtifactFixer instances for the duration of plugin dependencies resolution.
That should resolve the problem with the deadlock, unfortunately I didn't find a way to reproduce the deadlock to verify the hypothesis.
*** Bug 235383 has been marked as a duplicate of this bug. ***