I got a chance to debug PIVX clients that were going missing. Apparently they use some double-broadcast ridiculousness to get into an ENABLED state. I'll release a patch shortly so you can issue a single broadcast and then run the phantom daemons.

If you want more technical details, they create a catch-22 scenario where a broadcast goes out, is marked as PRE_ENABLED but the code doesn't respect PRE_ENABLED. When the network tries to update, it rejects it because the masternode isn't ENABLED, but it can't get ENABLED until it accepts the update. I've got a work around that sends a broadcast that instantly goes to ENABLED and then everything works fine.

The downside, you'll need to run the broadcast command and then run the phantom daemon -- so it's two steps vs. one step for DASH -- but still easy.

Update should be coming in a day or two.

best,
break