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That's great news, Neil, thanks for letting us know. I've spent hours trying to determine the cause of the problem, even considering trying to acquire a copy of OSx to install in a Virtual Machine, so that I could investigate more easily.
From what I can see of LibreOffice 6, it looks like they have rolled out the fix for the bug I reported some months ago, so maybe your problem was related to that. There are some similarities.
As an aside, I've been having a few problems with LibreOffice 5 (not related to macros or web queries) and they weren't resolved by LO6, despite multiple uninstalls and reinstalls. I finally fixed it by uninstalling LO and then deleting the user profile (which is not deleted by an uninstall), then reinstalling LO6, which forced the creation of a new user profile. It's now working better than it has for some time. It does appear that corrupted user profiles are the cause of a number of problems with LibreOffice and OpenOffice.