I have lost the develop right side column where i can do all my corrections. I am on a mac. I am in quick develop, or nothing.
Moving this discussion to the Photoshop Lightroom forum.
Are you saying you have lost the Develop module--which you can restore by doing a right-click on the top menu and putting a checkmark next to Develop:
Or have you have merely set the righthand panel to auto-hide and can undo this by clicking the little arrow at the right:
Retrieving data ...