How to emulate a mouse?
It seems that I have found a temporary answer. In the "Input" taskbar menu of Vitualbox, there is a mouse integration option. Left unchecked, Android draws the mouse pointer. However, if Mouse Integration is on, it relies on the host OS, which does not work. This option is less convenient, but it works for now. If anyone has any recommendations to permanently fix this, please post an answer.

~ P