Well when I had the problem with NXT4 right after I purchased it as an upgrade for 2009 it didn't work & Roxio support blamed it on my Windows install so I wiped & reloaded the computer to no avail. Now here I am years later. I just installed NXT4 on a freshly loaded Windows 10 PC & I still can't do more than 2 tracks at a time. Roxio keeps trying to get me to spend money upgrading to a newer version. Why would I spend money on something that won't be fixed if it doesn't work?