1.1.6 is the latest 1.1.x while 1.5 is the newest current version.
I suggest to use 1.5 anyway if You do not need Italian or Chinese translation which do not yet exist for 1.5 (1.6 would be a future version based on GRE 1.9
)
The version that hangs with no reason often is possibly broken (try reinstall).
That Gecko hang occasionally seems from DNS resolution on Windows. That is my impression anyway. This happens rarely. My solution shut down & restart K-M or TB.