tmux exits abruptly right after loading

view story

http://unix.stackexchange.com – I just compiled my own version of tmux with libevent. Whenver I run tmux, tmux starts, but exits quickly returning [exited]. I read here that the problem could be my configuration for default-command, default-shell, but I don't have a .tmux.conf file on my home directory, and as far as I know there is no version of tmux installed on the system. Interestingly though, tmux runs correctly with: tmux new $SHELL I have also tried creating an empty .tmux.conf with no luck, and tmux -v does not output anything else. any thoughts? (HowTos)