Did you run your app full screen right before this happens?
That’s what triggers similar behavior for me. It’s very annoying and has happened for a long time. I’m not even sure if I’d ever know if it was fixed because I refused to run full screen OpenGL apps anymore while the IDE is open.
I learned to not run on fullscreen when I program, but sometimes you just gotta show what you’re working on and that’s just better in fullscreen.
… which ultimately leads to: “Hold on, there’s some bug here, I’ll have to restart the SDK. Yes, this happens whenever I use fullscreen. No, it’s not a bug in the game!”