Item 1: One tester had trouble with the GDAL configuration; the dreaded Landis.RasterIO.Gdal.RasterFactory exception. After communicating with the user, I learned that she had a different GDAL folder than I do: 1.9 vs 1.9.1. Not sure why this is but I needed to make the code more flexible so that it could work with different GDAL versions. My new approach is to look at all the versions on the GDAL installation directory and pick the one with the latest version number. Although this isn't bulletproof because the app.config file also needs to be up-to-date, it is much more flexible and will hopefully solve the problem.
Item 2: A second tester was unable to validate her scenario. I believe this is due to the way I have the RandomNumberGenerator configured in the Validator object. Will look into it more tomorrow. Unfortunately she is working with extremely new code so I may have to build her extension myself to replicate the problem.
I'm glad we have more testers to find these issues before we publish the widgets.