I received an update to SkySafari 4.3 Plus on my Nexus 7 2013 tablet and Nexus 4 phone yesterday, and it has completely broken the app on my tablet. I have been in touch with Bill Schumy of Southern Skies, and he claims it is a bug in the Nexus 7, rather than a bug with the SkySafari code - something to do with obb files, whatever they are. Sounds pretty bogus to me, as the Nexus 7 2013 is a Google reference device, and it seems odd that the bug would only come to light now, and with this one particular update of one app, but he is adamant that it is the case.
Discussion on the Southern Skies Yahoo page:
https://groups.yahoo.com/neo/groups/...s/topics/10904
Anyway, I now no longer have a working copy of SkySafari on my tablet, although it still works fine on my Nexus 4 phone.
I don't know if the problem will reveal itself on any other devices - proceed at your own risk!