Trip-It, a popular travel assistant app, disappeared from my Note 3 soon after the last update to Gear Manager. Reinstalling from Google Play triggered an "unknown source/origin" alert from Gear Manager before Trip-It again went MIA.
Enabling untrusted app sources in Gear Manager changes nothing, except the freshly installed Trip-It will now be assassinated in silence.
I would guess that Samsung Gear Manager now mistakenly sees certain Android apps as Tizen apps instead, and likely attempts to move them into it's local repository of smart watch apps.
I have never been able to actually get a support ticket through Samsung's insane maze of half baked and often broken web forms - so unsurprisingly I alerted Trip-It support instead, after only a short and half-hearted, but still failed, attempt at said webforms
Trip-It replied that a few other users had reported similar issues, and that a couple had mentioned Samsung Gear or Gear Manager.
Unfortunately, after pondering the issue for a number of days, Trip-It concluded their investigation along these lines:
* Gear 2 is the only known common denominator for these issue
* Gear 2 runs Tizen
* Tizen is a new operating system Samsung has started trying out on a few mobile devices.
* Trip-It have no plans to support Tizen
(An interesting angle and resulting idea, which I guess illustrates why we stopped offshoring our support and development)
That's all I know for now, save that I also found the the version of Trip-It currently available on the Galaxy app-store is in fact left alone by Gear Manager. Could be a difference in app version, or the Samsung owned store is not subject to the same level of distrustful validation.