It worked! Thanks for that, I didn't even realise you could still access the old-style display settings dialogue. For some reason my central display was disabled (which would explain why Windows still knew it was there as #1, but wasn't showing up alongside #2 and #3).
Oh well, teething problems I suppose. I am glad it's working again, thanks again, I was pulling my hair out the other day trying to figure it out.
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