I was able to complete the Christmas event without a single problem, putting aside the fact that the decorated levels reset a couple of times, but I was able to get all the rewards. This week a similar event got started, but I am not able to get any levels decorated. I summoned the free decorator droid and sent it to one of my levels (Workout Center), left the elevator, but never got "inside" the store, nor I got a animation like I got every time I decorated a level on the Christmas event. I got another droid and I sent it to the same level, with similar results. Then, I left the game for a while, and when I played again, my Workout Center was decorated, but with no notification or anything.
And I can't decorate any other levels. I have tried with 4 or 5 levels, even sending two decorator droids to the same level as I did with Workout Center, with no results. I even did a backup of my TDS on Facebook and reinstalled the app, but the results were the same (my TDS got even worse, because now I have a lot of levels with the generic background). Does anybody have this same problem or know how to solve it?
EDIT: Additional information: I'm playing with version 1.4.1 of Tiny Death Star, on Android 4.4.2 (KitKat). My device is a Nexus 7 (2013).
2ND EDIT: Added screenshots from the Spanish version of the game.
3RD EDIT: I haven't received an answer from tech support, but it is fixed now. I saw a decorator droid coming, but was not the Christmas one, it was R2-Q5 instead. I stored it on Arrivals and closed the game. When I opened it, everything was fixed, even the levels with generic backgrounds I had. The only thing I did was connect my device to another Wi-Fi signal instead of my home's.