Every now and then, seemingly at random, I click on something and then it refuses to ... well ... "unclick". I can move the mouse around. The keyboard still works (eg. shortcuts etc). I can move the mouse pointer outside the virtual machine and it behaves entirely normally there, But inside the virtual machine, the mouse is behaving in every way as if I have not released the mouse button. But I assure you I have. lol. Clicking the physical mouse (or trackpad) again doesn't change anything. It's just stuck. Even moving the mouse outside the virtual machine and back in again (including releasing it with Control-Option if necessary) doesn't fix the problem. I can do anything I like outside the VM. But move the mouse back into the VM and as far as the VM is concerned I never released the mouse button. The only solution I've found so far is to move the mouse outside the virtual machine and then choose "Restart" from the "Actions" menu. That works as long as there's no dialog in the VM that won't allow a restart. If there is such a dialog, then I've had some limited success pressing command-option-escape to bring up the force quit window, and using arrow keys to navigate to the "dialoged" app and force quitting that - although that hasn't always worked either. Sometimes the only solution I've had to this is to choose "Stop" from the "Actions" menu, which obviously isn't cool. I'd have to assume this is a bug, but it's very intermittent and I have no idea how to reliably replicate it, so that makes reporting it difficult. I wanted to ask around to find out if anyone else has experienced this before I do report anything, in case those experiences might help. Has anyone else experienced this? If so, have you found a way to "unclick" it? Parallels Desktop for Mac v 13.1.1 (43120) as well as a few previous point versions. macOS X Sierra and High Sierra guests. macOS X High Sierra host. New 2017 MacBook Pro 15" maxed out.