I opened the nbwicketsupport project and, with focus in a java source, right clicked in explorer. The UI was frozen for about a minute. Thread dump
Created attachment 46639 [details]
Note I was editing a file full of references to JMI classes that cannot be resolved, fwiw.
Seems more like RecentProjectsAction problem to me.
duplicate of #106037
*** This issue has been marked as a duplicate of 106037 ***