I am running Ethereum Wallet 0.5.2 (newest I think) Mist on Mac OSX 10.11.3 El Capitan. (Says Geth under Activity Monitor.) It catches up with the blockchain every time I start it but after it opens it ALWAYS falls behind and says something like "14 minutes since last block".
It shows I have 10 peers right now and I seem to always be able to connect. When I try to send any Ether it just hangs there as if it is sending but it never does and then when I exit I get a timeout error. Is there a port that needs to be open or something? (I get peers though so it seems like it can connect.)