I can currently reproduce this bug at will in my current project.  Here's what I did:
 
I wanted to replace a concrete class w/ an interface, and (not taking advantage of the refactoring features like I should have) I created the interface and deleted the old concrete class.  I then performed a search/replace on one of the affected files for the old concrete class name, intending to replace all occurences with the new interface name.  The search parameters were: whole words only, direction forward, global scope, and entire scope.  Upon pressing the Find button the UI hangs with CPU pegged at 100%.
 
Chad Stansbury

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