Actually Inger the issue I have with the error message is irrelevant to the problems Mr Rooky is having, I only mentioned it as an aside that I couldn't send one.
I am however experiencing the same issues as Mr Rooky, not only in the inspector pane, but actually everywhere ease within the SD working area, once it starts to lagging again.
I decided to try once more, and realised that it appears to be a lagging issue which appears to make the container selection to appear to be not working, in fact on my machine it took a full 2 minutes (which feels like a lifetime) for the container to be selected.
This is on a 50 page website, (a template I am making, which only has 4 actual images (the rest being placeholders, and un-styled (straight our of the box so to speak) headers / paragraphs with dummy text and a few CTA buttons and a menu/footer symbol on each page.
I have the luxury of being able to go back to previous SD5 versions, which Mr Rooky doesn't as he has only just upgraded. I will of course update reverting back actually fixes this SD v5 lagging issue, but perhaps on a different thread, so as to not cloud the problems experienced by Mr Rooky.
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