Xcode code sense stopped working

Hi,
I recently got this problem, the code sense does not work at all. Recently I changed by mistake keyboard shortcut (Preferences/Key Bindings/Edit/Completion List) to something else, then I changed it back to Escape key. Unfortunately I cannot get the Completion List working again. I tried (many times): restarted Xcode, clean/rebuild code, performed Rebuild Code Sense Index (in Get Info dialog), exchanged the Key Binding to other keys, also, I played around with options in Preferences/Code Sense (Automatically Suggest immediate, etc) with no luck. I spent few days trying to get this working again. The Code Completion List just does not appear any more. Any ideas?

Ok I managed to correct the problem (recreated project)

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