My Mac OS X boot partition has been tight for space. So I used Carbon Copy Cloner to replicate this partition on an external drive, repartitioned the internal drive, and used CCC to restore the boot partition.
When I restarted from the restored drive, Snapz Pro X announced it was running in demo mode. When I registered with the number I had, the registration tool announced it needed to refresh my registration. That went smoothly, and Snapz seems happy.
Since then, Snapz has twice announced it's running in demo mode, once right after restarting and again just a few minutes ago (one day after restarting). Each time, I enter the new registration code and Snapz is happy ... for a while.
I've been running various releases for Snapz Pro X for three years and never encountered this problem before.