Window opens but immediately disappears. This happens with multiple apps
If you once had them in full screen mode, by pressing the green plus sign(+) in the top-left corner, it may be reopening them into new full-screen views, which is called Mission Control. 

To check, do any of the following:


On a trackpad, swipe left or right with three or four fingers. On a Magic Mouse, swipe with two fingers.
Press the Control key and the Right or Left arrow key.
Enter Mission Control, move the pointer to the top edge of the screen to show the Spaces bar, then click a space.


Let me know if that resolves it!