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I'm using the Theme Builder import macro on a page with the deck and card macro and the first time you load the page the import macro does not load the data. When I refresh the page in my browser it works.
I suspect that the problem will be caused by something on your imported page interacting with the deck/card - to test this set it to some basic 'text only' content.
You are correct, when I remove the deck and card macro it works. Does anyone know of other macros that do tabs?