I had 3 OS on my Mac via Fefind (OS X, Win, Ubuntu) and everything worked fine with trial parallels 14 ! After I installed Parallels 15 and first time run bootcamp-based windows 10, Parallels 15 asked me to reboot my vm after Parallels tools upgrade. Then vm can not start as it can not find loader!? I checked my EFI partition and found that there is no any data in it. Wow! So now I have no access to my bootcamp-based VMs and thanks god I decided to check EFI partition and reinstall refind. Or I would loose access even to OS X boot. Parallels is so parallels. After many years with VMWare I decided to try it and "welcome", "enjoy". How broken is 15 version if it can destroy data on Efi partition???????