When loading ExploreStars on an Android tablet, you must first add English to your language list and make it Primary before running ExploreStars for the first time. Once you have run ExploreStars once in English, you can then return your primary language back to your desired language.
A problem has been identified with French being set as the primary language in that it causes ExploreStars to crash without a warning message. This does not occur when the primary language selected is English, German, or Spanish. French may not be the only language that causes a crash. After returning your primary language back to your desired language, start ExploreStars again to verify that everything works and there is no problem.