Yes, installed 3.1.1.5 and at first glance it’s working now. At least I don’t get the
message “A variable mismatch has been detected” any more and the changed text remains in the Alt text/title and Description fields.
Still seeing some issue with WPML translations, but I will test with a new fresh install tomorrow. Have changed so much in my current test installation it’s better to start from scratch.
Thanks for your quick delivery of a fix!