Adobe has released an update (11.1.1) for Premiere Pro CC 2017 that fixes a critical bug that deleted user media files when the new automatic media cache management tools were used incorrectly. The new Media Cache tools can be found under Preferences > Media Cache, and were designed to automatically remove aging and unused media cache files. Reportedly, the unintentional file deletion occurred when the Media Cache was moved from its default location. Regardless, users can avoid this issue by updating to Premiere Pro CC 2017 (11.1.1).
The 11.1.1 update also fixes a bug that caused extreme positive or negative values when normalizing all peaks on audio clips.