Upgraded from PD 17.x to the new 17.1 and it's been a disaster. Parallels Tools (Win 10 latest build) hung during upgrade and now the previous tools version is half installed and my VM is hanging and crashing left and right. I haven't been able to uninstall (Win doesn't see it as installed) or reinstall even in safe mode because error 1714 (old tools partially installed). Now I'm trying to get the MS Program Install/Uninstall troubleshooter going, to hopefully remove the old installation, but no luck yet. I'll probably wind up having to restore my VM from backup, which will be a painful recovery. I'm usually good about waiting a while before updating because of bugs, but it's been years I've had PD .x update completely blow up on me like this, so I let my guard down. Won't happen again. Be warned. Extra fun is I can't find a copy of the previous 17.x version installer to try that again. I guess I forgot to save it offline, which I usually do, knowing Parallels for some reason now refuses to keep them available. Sigh.