@Dave-R Got it! Thanks Dave...it did seem like overkill to lock both the viewport and the layers, but it seemed like one of my viewports was shifting (even though camera positions weren't changed) and I thought maybe I had been double-clicking into the viewport(s) w/o realizing it. Still not sure what I did, but it seems to be working now.
Currently, it's still beta, but I hope to graduate to 1.0 in the next month. I hear the feedback on the watermarks. I will reduce the watermarks in one of the next versions to make it easier to test.
@Mike-Amos - Like Rich already said it's a one-off payment. $74.99 for SketchUcation premium members and $99 for non-premium members. This is the price for the beta and the subsequent 1.0 release.