Tabular Editor "Unable to load Tabular Model"

Thanks very much. This has worked. I must have missed the bit in that blog I linked to which says that this feature isn't strictly necessary for using Tabular Editor - I had it in my head that it was the introduction of this feature that meant TE could now be used in this way. It's unfortunate but it looks like any PBIX file created whilst that option was switched on still has the same error appearing. I'd love to use Tabular Editor but if the preview feature preventing me is going to be generally released at some point, perhaps I shouldn't be getting used to being able to... ?