For all of you with Blades issues, unfortunately me and Sandor haven't Blades to test with Minera and CPUMiner so it's really hard for us understand and fix your problems.
What kind of stats you haven't? Are you speaking about the history graphs or the whole stats?
To clarify something: Minera img isn't changed since I uploaded it. It should have the 0.1.8b version on board and you should update to 0.1.9 after installing it (notify icon on the upper right corner). While this doesn't change anything for you problem.
If you receive the red box telling you there was a problem this could mean minerd process is running but it hasn't stats or stats can't be correctly parsed.
To check this, when you start minerd, try to look at your rpi doing:
ps aux|grep minerd
You should see a couple of lines one with the screen command and one without it, if there aren't these lines, try to start minerd manually by putting the command line directly in the ssh session and see what happens.
Then, check the raw stats by pointing your browser to "/minera/index.php/app/stats"
If they show only a {"error": true} then try to check them in the SSH session with:
echo -e '{"get": "stats"}\n' | nc 127.0.0.1 4028
This could be useful to understand what Minera really get from cpuminer.
Enabling cpuminer log & debug could help more, check the log at: /var/log/minera/cpuminer.log