Microsoft has released yet another new Xbox One Preview update for members. The latest preview update build rs1_xbox_rel_1608.160826-1142 fix issues with game trails and game DLC.
FIXES
Game Trials: Resolved an issue which sometimes prevented users from purchasing the full game after participating in a free trial weekend.
Game DLC in collections: Resolved an issue which could cause managing DLC for certain titles to crash your game collection.