Try saving and rebooting your computer. It could be a static lock problem.
You could try an IT reset -
On a laptop - power down the machine, unplug it and take the battery out so it has no power source and hold the power button in for between 30 seconds to a minute, then refit the battery, plug the power back it and boot it up again.
On a desktop - shut down the machine, wait for 5 seconds, if there is a switch on the back next to the power cord, switch it off, then unplug the power cord, hold the power button in for 30 to 60 seconds, then plug the power cord back in and switch the power switch on the back back on again, then switch on the computer with the power button on the front
Mixcraft 8 Pro Studio Build 418 (64bit)
AMD Ryzen Core 3.0 GHz,
2TB SSD etc, 24GB RAM,
Windows 10 Professional
Focusrite Scarlett 18i8 (1st Gen, USB2).