The most useful feature of this new release is an option to use wkhtmltopdf engine to generate PDFs. This engine allows to generate really large PDFs and consumes less server resources (time and memory) than previously used default 'dompdf' engine.
Feature: new advanced setting "Continue Survey From Last Page" allows to resume survey from last visited page.
Fix: IP-based and cookie-based flood control issues.
Fix: edit of Columns question in backend submission.
Feature: new 'Rating Table' question setting 'Results Options -> Frontend Results -> Expand Sub-Questions': displays separate results chart for each sub-question. Single chart with aggregated answers from all sub-questions is displayed if disabled (previous behavior).
Fix: Priority List improvements for mobile devices.
Feature: ability to delete previously uploaded file on survey revise.
Feature: new submit setting 'Multiple User Submissions' allows a user to pass survey multiple times.