I have had a similar problem - it seems to occur when I am moving sliders in the parameters window, particularly those that have huge numbers e.g.moving an actor across a big room by mousing.
My solution is to click on the number above the slider and type a numeric value instead of mousing in big sweeps. This does not work for everything, some products are just funky and some seem to be designed for Poser so perhaps they work perfect in it but not so well in DAZ Studio.
Another workround I use sometimes is to find an object already roughly where I want to move my actor or prop to, then parent the new actor to that object. Now I can go to the parameters and option(Alt)-click on all of the values that are different and presto, the new object and the original are in the same spot, then it is only a small move to unparent the actor and fine tune my new actor’s position instead of great sweeps of mousing that can make the pointer disappear.
Make sure you save your stuff often, it’s really the only way to deal with this type of fault: luckily you can still save your work without the mouse and restart DAZ and everything should be back to normal.
This might be a bug but I’m not sure what in, could be the OS, could be DS, could be the connection between the two.
I just hope it is fixed in the next update.
Hope this helps you.