I'm going to start by bucking the trend here and saying that the wasteland explorer limit doesn't bother me at all. It's silly to have 50% of your people out in the Wasteland looking for Legendaries. So yeah.
The things that have been bothering me, however, and were introduced mainly with this last set of updates:
1. Weird glitches in the Vault Door room. I have a front guard armed with a laser gatling, and on multiple occasions an assaulting raider party has simply jogged right past him with no resistance to start shooting in the next room. It's not every time, but happens often enough now that I'm always ready to start chasing them down the hall.
2. Raiders in Vault Door room shoot guys on second floor. Another WTF moment, and it has happened multiple times now for me. Raiders bust in, park in Vault Door room, front guard does NOT shoot back, and my guys on the second floor are taking damage. How does that work?
The new raider looting code just seems to be a bug-riddled mess right now.
3. Dwellers who don't want to transfer rooms. The bane of my existence now. In the initial Fallout Shelter release, occasionally a pregnant dweller would refuse to be transferred to a new room - you'd grab her, and as soon as her icon left the room the grab would release and she'd stay where she was. That doesn't seem to happen anymore, but instead now dwellers in general are releasing their grabs at random, which often makes it difficult to get them out of harms way. I've lost countless dweller lives this way, as a dude near death simply refuses to get out of a fire room.
These are all happening in Survival Mode.
Caveat: I'm running on Bluestacks PC, rather than Android proper on a mobile device, so I admit that this may be a factor in the UI issue. But these problems didn't happen for me prior to the 1.2 update release.