Parallels VM window is disappearing

[Maria@Parallels]

I really wonder about a product when all of a sudden the VM window simply disappears - you can see it in the control center. It is running!,, BUT YOU CANNOT GET THE WINDOW TO DISPLAY!!!!! WHY! It takes a call to Parallels to get it open. The thing happens again. WHY?

Hi, please let us know which mode are you using? Is it full screen or coherence? May be you're using second monitor? So, please provide us with the detailed step-by-step instructions how to reproduce the issue disappeared VM. Thanks in advance.