I just had the same thing happen in 8.6....although it could be the way I "downgraded", "ungraded", "went back"... I just installed 8.6 without uninstalling 8.7 (I didn't want to lose any settings, PIs, etc.) It seemed to overwrite the files and when I checked the version it said 8.6.... soooo..... I really don't want to be thought of as a computer ignoramous...so please tell me it's not my fault