Right after the most recent update, I also had the same thing (i.e. android app launcher failure) happen two or three times, but I kept resetting it and, lo and behold, the problem seemed to go away. Now, I have a new problem--all of the bloatware (including some of the ones I was using) have been wiped off my desktops. They still reside on the Kobo, and I can still access them through the all apps button, but they don't sit on my main pages. Further, when I try to drag them out, they'll last there only until my next shutdown. This also applies to any new Getjar apps I drag on.
Does this happen to anyone else? Any theories/solutions?