I'm using the current unstable 'app-misc/tmux-1.9a' for quite some time on a few amd64 machines and found no problems. The current unstable version entered the tree in February 2014. Reproducible: Always
Stable for HPPA.
arm stable
amd64 stable
x86 stable
ppc stable
ppc64 stable
ia64 stable
Stable on alpha, closing.