Numbers crash when I mouse move a row, insert row above or below existing row

Hi,

I'm using a mac mini, late 2014, 2.8GHz Intel Core i5, 8 GB 1600MHz DDR3, 1TB of storage, OS X El Capitan 10.11.4, "Numbers 3.6.1"

The problem I'm having with Numbers is when I mouse a row to move it elsewhere on the spreadsheet, the whole program crashes.This has just started the past 2 or 3 days. I have reported it to Apple, but have received no remedy. I tried to copy and paste the row, many times, however, when I went to add a row above or below, Numbers crashes again.

I've tried restarting Numbers, running "disk utility" and restarting the computer, however no change.

Does anyone have any thoughts on this?