When first opening the virtual keyboard, I can press the keys normally. But once I click on the main window or away from the virtual keyboard to switch to another sample, the virtual keyboard unfocuses itself every time I try to press the keys. To be able to press the keys without it unfocusing, I must open the key dropdown menu (the one on the bottom left that changes the amount of keys), which only fixes the problem at that moment and the problem comes back when clicking away. I also can not press the keys with the keyboard without first successfully clicking the keys with the mouse. I can't open the dropdown menu on the bottom right, and if I try to, it unfocuses and triggers the issue again.
But moments later when typing this, the problem disappeared, and I don't know what caused it nor what stopped it. I had the issue when playing from the samples list and instrument list, then it disappeared when I kept trying to play from the instruments and discovered that I can open the bottom right dropdown menu now and that the problem is gone.