This is not a bug. tmux does not support bce as stated by its author below. Check your TERM and make sure it is a screen variant that does not advertise BCE.
------------ http://comments.gmane.org/gmane.comp.terminal-emulators.tmux.user/1931 ------------ This is called background-colour-erase (BCE) and is not supported by tmux. Applications should not depend on this behaviour unless the bce flag capability is in the terminfo description and for TERM=screen it is not: $ infocmp -x xterm|grep bce OTbs, am, bce, km, mc5i, mir, msgr, npc, xenl, AX, $ infocmp -x screen|grep bce $ -------------------------------------------------------------------------------------------------------------------------------------- ----------------- man tmux ------------------------------------------------------------------------------------------------------ default-terminal terminal Set the default terminal for new windows created in this session - the default value of the TERM environment variable. For tmux to work correctly, this must be set to `screen' or a derivative of it. -------------------------------------------------------------------------------------------------------------------------------------- ** Changed in: tmux (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/924209 Title: Transparency / BCE To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mc/+bug/924209/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs