Not exactly Since i've been updating continously till v3.25 (v3.27 and v3.28 were giving me problems). I've always had my settings set as posted above, so i'm really curious if v3.28 is gonna be fine with the 'ac systems' settings changed to SINGLE now. So far, so goodif you update your alphacrypt cam to 3.28 without checking if the settings stay the same..
The only issue i was running into with v3.27++ with 'ac systems' set to MULTI, was no video after tuning (audio is hearable), so your 1st sympton