I totally agree with DanielL2. I bought recently a new license (80 euro's !) and having several issues with Parallels 10 with Windows 10, this is only one of them. (e.g. this morning the VM wouldn't start up after a Windows 10 update, only after I resetted the VM). I'm using Windows only in coherence mode, and I see in this blog that Parallels hasn't done nothing on this problem for more then 7 months now! It's a big shame. You pay a lot for a buggy application, and my experience is also that Parallels let you pay again for every upgrade of e.g. OS X. Shame and blame to this company.