Lose mouse cursor, or sometimes just wont connect.

I have three computers working with multiplicity, when it works it great, but one of my new computers a Laptop has much trouble connecting.  It is hit and miss.  I checked use this IP, but I went to the configuration of the secondary computer and found it was using a Hamachi IP on my system, even though I checked to use the system IP.  I also don't know what shows which IP it is using, it doesn't always show.  Is this check on "use this ip"  just a "Guidline", how does it work?  Also If I am lucky enought to get it to connect it will sometimes lose my mouse cursor.  I have found that if I unload Multiplicity the cursor comes back on the other system (Primary, and the other Secondary), but not on the Laptop.  Is there a way to get it to work consistanly.  Like I said when it works it is excuisite.  But I find myself spending many minutes of my day trying to get it working again.  Rebooting both the Laptop (secondary), and the primary system to see if I can get it to work.  My other secondary seems to always work, I don't see anything different in the configuration.