Does the share icon react at all when you click it? On my set-up, the button turns orange and gives me a drop-down box of 6 options. Screen clip attached.
Do other buttons in FTM perform as expected?
I have a dual-monitor set-up. If my FTM window is maximized, the drop-down menu actually displays on the 2nd monitor. Any chance that is your case?
I'm sure other members will have additional ideas.