byobu+tmux 2.0 crashes after startup

I recently download, compiled, and installed tmux 2.0 from https://tmux.github.io/ as I needed a few of its new features. When starting byobu (5.94, for the record, but also happens with 5.74, e.g.) with tmux backend, it crashes a few seconds (varies between 0 and 20) after startup and does not accept any input anymore. I can see the clock in the status bar updating for a while and then it stops.

I already deleted ~/.byobu and ~/.tmux.conf (if that is loaded at all?) which did not change anything. I do use zsh as shell but changing my shell back to bash did not result in any further success... Switching byobu's backend to screen fixes the issue, but then I have to use screen ;) Downgrading tmux to version 1.8 also fixes the issue, but then I cannot use the new features ;)

Comment from the maintainer of byobu on stackoverflow regarding the issue:
"It's likely a permissions issue, perhaps something in /dev/shm, where the distro version of tmux 1.8 sets up those permissions properly in the package maintainer scripts, but your self compiled one does not do so with a simple 'make install'?"

I attached an strace of byobu before the crash. Please let me know if I can provide any other debugging info.