Windows 10 Taskbar Problem

[xxyzz]

I have Hoster running and have it minimized on my Windows 10 taskbar, there is a blue line under it just like all my other open programs. When I click on it, sometimes it does not open back up to full view, even if you use the alt+tab command you can see Hoster but not get it to open back up. It was stuck like this for the last ten minutes and now all of a sudden it is working.I have had this happen during my last show and have no ideal what is causing this.