Sum only returns ###

All of a sudden, previously functional spreadsheets are now only returning ### for the Sum function where, in the past, they’ve provided the correct answers. I’ve rechecked all cell formats. Everything seems correct. Something changed somewhere but I can’t figure out what.

The column is too narrow to display the result, widen it.

Thank you, erAck!! It worked! Widening a column changed the cell content from ### to the Sum formula which was obviously too long to fit in the cell, thus the ### was displayed. Went to the View menu in the Menu bar and discovered that the “Show formula” option was selected. How that happened, I don’t know. But when I unselected that, BINGO! All Sum cells displayed correctly. Thanks again, and also for the quick response! You saved my day!

Great. If you then please would mark the answer as correct by clicking the check mark and possibly upvote? Thanks.

So how the heck do you upvote?

Click on the upwards pointing arrow head above the number. Thanks.