For folks experiencing the blank setup wizard issue (and similar startup issues), we've investigated some of the causes and we've made some bug fixes in our latest beta to address this. It's video hardware and driver dependant, so we might not have tracked down every last issue, but we think v29 will be much improved. We've just posted the v29 beta on the forum at https://www.dropboxforum.com/t5/Desktop-client-builds/Beta-Build-29-3-18/m-p/225422#M4009
Please let us know in the v29 beta thread if you're still seeing any of the same issues reported here on that build (and of course any new or different issues).
My apologies for the impact these bugs have had on you, and thank you for the feedback and bug reports.
