I'm using Lightroom CC 2015.12 Camera Raw 9.12
When I clear history it also removes the import step & I can not revert to my original image. I do not have a 'revert' option listed under File tab either (seems like I use to have this, but I can't remember for sure).
I'd appreciate any help so I can return to editing photos.
In the lower right-hand corner of the develop module there is a reset button that will reset the image to the default settings that are applied when the image is imported.
Thank you JimHess! That solved my issue.