I first upgraded from Desktop 2.2.4 to 3.0. Then I uninstalled, deleted the Qlik folder, restarted the PC, ran desktop as admin, and tried hitting F5 multiple times.Still, after the splash screen, this is the only the screen I get.
I had this problem, I'd uninstalled V2 and installed V3 but just got the blank screen above. For me, I fixed it by closing all Qlik programmes going into task manager and 'end task' on any Qlik stuff running - Be aware the programme running might not be called Qlik (I had two called engine)
I then ran V3 and it started straight away without issue.