I think I found the culprit. The old spreadsheet that was C&P'd into the Ibox was getting overlayed with the new one instead of deleting the one that was there first.
Now you don't get the pop up message that says allow. It automatically accepts the C&P. You don't also get the Pop up after that says this appears to be a word doc. At which point I used to say cancel then allow again.
Any clues as to how to fix that without rebuilding the Ibox?