ive noticed that sometimes when minecraft crashes the messages & errors box goes a bit weird and looks like we have gone back to XP im not sure what causes it but it appears to be minecraft crashing the worst thing is u have to go into task manger to close it as the cross does not work as you can see in the top left
I had issues with the command line loading thing that runs along side your game when loading and playing not wanting to close
I too had this same issue happen. Recent occurrence happened when I was switching between modpacks and had forgotten to exit out of previous message & error console window. As I was trying to close down the launcher and the consoles this happened. I had to force close the window using task manager as it did not allow me to close it any other way.
I have had Win10 from day of release, had minor issues but none with Minecraft or the MyM launcher. Wondering if maybe it a video card issue where its loaded in the video cards memory but is not getting unloaded for some reason. Only thing I can think of that we would all have different than each other would be hardware on our systems which could cause the issue.