Gant function threw off all my external links in a prticular column. Not knowing this had happened, I had saved the work.
Is it possible to restore a prior iteration of smartsheet?
The Support team can look into sending you a checkpoint of your sheet. Contact them at support@smartsheet.com
In the future, I would recommend you backup your sheets. Here’s how: http://help.smartsheet.com/customer/portal/articles/506499-backing-up-your-data