Wow.
I've had this problem intermittently for several years:
Spent hours ensuring columns in Excel were correctly formatted etc - and occasionally that was the problem, but often formatting made no difference - so I would come back to it a day later and then it would work... (This is now a duh moment! - why didn't
I see the pattern?!)
So today the first import went fine, then when it **** out on the second, I closed and re-opened Accessand then it worked. No changes to the file, but now it would import.
Magic!
Thanks for the workaround - just saved me hours of frustration!