Local Lightning 5.0.6 not working

I’m using local lightning 5.0.6 on windows 7(64-bit). It worked just fine yesterday. But, today not so much. It’s open when I clicked but it’s nowhere to be seen. I can see its tab at the bottom. This happens even with 5.0.7. What could be the problem?

Update: Everything is ok now. It has something to do with the tab. Yesterday, I just click on it at the taskbar and press Alt+space and click maximize. When I click minimize straight from the local the same thing happens again. I just have to repeat the process every time.