Question: Can't open Numbers files now March 2018- What happened?
I've read about the problems some users had after they upgraded to High Sierra. But I did that months ago and I've opened my numbers spreadsheets many times with no problem.
Today I tried to open a Numbers file that was more than a year old. Couldn't do it. Tried to access the earlier versions in iCloud backup. didn't work.
Now I can't even access the newer Numbers file that I use every day.