Hi Yobani – thanks for your response, much appreciated.
I have UpDraft Plus, but the problem pre-dates that. But perhaps it is the popular image replace tool interfering with the process….I might ask them about it before I start pulling things apart. I really can’t think what else it would be. Thanks again for the lead.
I’m going to leave this open for a little while and post the solution when it (hopefully) comes along.
