I'm running weechat(1.0.1) in a tmux(1.6) session on my Raspberry Pi (Raspbian[Linux 3.12.28+ armv6l GNU/Linux]). One of these two breaks screen updates. When running weechat by itself it works fine and no other software that I have found suffer from this issue. Nano for example works fine within tmux.
Ctrl+L or resizing of terminal seems to refresh the screen once.
I have no clue what causes this or where to start debugging.
I've tried purging and reinstalling both programs as well as completely removing the settings files from them both.