Folie / codeless builder issue with updating main images

We created our website using folie about 4 years ago, have kept it up to date etc all okay.

Lately we have noticed that we cannot update some images in the codeless builder - the link to change the left hand pane doesn’t appear on hover.

I have the original install running on my laptop using wamp where this is possible so something appears to have happened, possibly in an update?

Can anyone suggest something? Tried different browsers, clearing cache, updating everything

Hello @sjstyles

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Thanks,
Codelayers.