In this case, seems ok.

Just to point out. On one address with more than 50000, you can mine once in 40 blocks. That's why it stops after he found one.
You must get more nodes connected to you wallet:

addnode 82.211.1.181 add
addnode 91.230.123.5 add
addnode 91.230.123.11 add
addnode 91.230.123.81 ... till 88 add
addnode 91.230.123.131 ... till 140 add


enjoy !

EDIT!. The wallet freeze from the fact that "debug.log" is spammed with messages, when you left out with addresses that could mine till he found one valid. Check the debug.log