This is a form tI reported this yesterday, and I thought i'd try deleting the DayZ folder from MyDocuments. It worked the first time. But then I went back to the server today and it CTD's again ! Now, deleting the DayZ folder doesn't fix it.
I really don't know what to do. It's a problem, because mods like 'PartyMe' restore their default key settings every time you join a server. It uses 'T', and 'T' is the old Arma 2 default SPRINT key, which I prefer to use, and have used since 2012.

Also, I can no longer use the controller column of the config area to set a separate key. I wanted to test Y and C separately for sprinting to see which felt better. But DayZ combines them into C + Y instead of two distinct options !!