I also ran into the blank screen issue. I was able to get past the activation one by just waiting long enough and switching apps repeatedly (while trying to search for a resolution) and it fixed itself enough to enter the code and continue.
The state purchase was another story. The only way I could get past that (and this took a LONG time) was to change resolution every time I wanted the screen to refresh. They use an embedded web browser to do all this stuff (lazy) and for some reason it won't refresh correctly. So for example, what I did was get the white screen, then in Display Settings change my resolution to 1600x900 and then back to my normal resolution. Typed into one field (it probably won't show what you type), switch resolution to 1600x900 and back again, and it will now show what I typed. Go to the next field and do the same... Rinse and repeat about 87 times and you should get through the entire process of buying state.
