Can confirm... I just enabled custom models, added dark to my cam, and manually triggered. Got a -1 error. Then went to general AI tab and saw "start now" button. I guess enabling the custom model stopped the server. Anyway I started DS up, and manually triggered again, and did not get the error.188.8.131.52 is working fine for me. DS is working for detection.
I think Deepstack -1 means that Deepstack isn't running (or BI can't talk to it). You should be able to confirm this by clicking on the Test link on the AI configuration page.
Edit: Same seems to be true of enabling facial recognition. It also stops DS. You just have to go back in after saving, and start it back up. Not super complicated but it's good to know.
Edit 2: On the other hand, I am now getting error 100's from having facial recognition enabled. Haven't dug into that one yet.