Before if it happend that the window was not visible, I simply closed SkyDemon for Mac, and restarted it again.
Then it came up normaly and I could use the program.
I also had this with the current and last version until 2 days ago, now I cannot see any SkyDemon window.
I start up SkyDemon for Mac, I receive the prompt to agree to the licence, after I agree, that window disapears and nothing happens ...
Whatever I do, I cannot bring up the active window to be visible.
If I do a Window Minimize from the menu, I see an animation in a split second of an open SkyDemon window disapearing into the task bar.
I just can not bring it back.
I even got a prompt to update my charts ... so I know SkyDemon is running, but I cannot see it.
Before sometimes selecting a Window SkyDemon Plan from the menu bar also helped.
Now it is just invisibly running in the back ...
My iMac is still running on Yosemite 10.10.5