I just upgraded my QlikView client to 11.20.12451.0 SR7 64-bit. Now when I open up a document which was working fine on an earlier 11.20, my main chart has the error "All Expressions Disabled". The chart has all its expressions in one cyclic group. If I add another expression (e.g. 0) and make it invisible, the cyclic expressions work. So it seems that in this version you must have at least one enabled expression which is not part of a group, in order for the chart to show the data.