For now, the best thing to do is join the IRC channel and ask a question. Stick around a while. It may take some time for someone to notice.
First, some sanity checks. If you check the status of the plugin in the terminal, it should read something like this:
$ sudo /usr/sbin/update-pepperflashplugin-nonfree --status Flash Player version installed on this system : 13.0.0.nn Flash Player version available on upstream site: 12.0.0.nn
If you check the browser's about:flash , it should say something like
About Flash Chromium 34.0.X.Y (Ubuntu nn.nn aura) OS Linux Flash plugin 13.0.0.nn /usr/lib/pepperflashplugin-nonfree/libpepflashplayer.so
Next, if running "chromium-browser" from a terminal works but running from the icon in the dash or from search doesn't, then you should un-pin the chromium icon from the dock, then open a terminal and run,
grep -l chrom ~/.local/share/applications/*desktop |while read f; do rm -v $f; done
then search for it in the dash and run it normally. Feel free to pin again.