Just a quick follow-up on this. Erwin is still working on a fix that should work better than the previous one provided. One of the users told us that it is possible to use version 16 with the old Qualtrics JFE engine, if you add “Q_JFE=0” to the url of your survey. We are testing this at the moment. As soon as we are confident enough it is reliable, we will publish a new version of the engine that automatically adds this to the url. In the meantime, you may try it yourself and see whether it helps.
Our sincere apologies for the delay.