Dashboard share option : this could be due to permission issue, check on wht kind of permissions are you provided to respective users.
What if analysis:
From the Home screen, select What-If Analysis under Optimize Capacity in the left pane. From the Quick Start screen, select Plan in the second-from-left column. Click Select in the pane titled Add Workload
I had the same issue. Also the "Interaction" icons were missing from my dashboards as well. I switched browsers from Chrome to Firefox and the issue was resolved.