tmux-1.9a2 ctrl+b not working

[DJ Sylvester]

I searched Google.
I looked at sourceforge tickets http://sourceforge.net/p/tmux/tickets/
I've read this Cygwin tmux announcement:
https://cygwin.com/ml/cygwin-apps/2014-06/msg00018.html
I've reinstalled tmux with cygwin-x86 installer.

I've had no luck.

ctrl+b "command" is not working for me.

I'm running a default mintty as installed by cygwin-x86 on Win-7 with a
few aliases defined, nothing else. My.tmux.conf file is empty.

To reproduce:
1. start tmux
2. ctrl+b % (outputs 5u)
3. ctrl+b " (no outputs, does nothing)
4. ctrl+b c (no outputs, does nothing)

No commands are working. Not sure what to try next.
Thanks.

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