Thanks for all the pointers - I’m currently at work but I’ll work through the suggestions tomorrow and report back the results - I agree, I suspect it is some random app I’ve added or an update which has probably caused the issue. And, no, I’m pretty sure there’s nothing in the project causing it - the behaviour is the same for any book. Curiously, if I click and drag the text I can see it briefly floating above the gui in black / transparent.
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