quiz statistics report : language strings are being concatenated in order to create titles for response analysis tables

You need a quiz with lots of complex statistics. Restoring the backup from MDL-41757 is proabably the easiest way to get that. Having restore that, go to the quiz, Results -> Statistics. The bit we are particularly interested in is "Download full report as". Download the full report as unpaged XHTML and check it has headings like 'Analysis of responses for ( [question number] ) " [question name] " Download the full report in Excel or ODS format. Check that the indivitual sheets are called things like '( [question number] ) " [question name] "' There are four variants of these strings, depending on whether the question appears at a fixed question number, and whether it has variants.