Installed CWM on note 2, but the phone is not rooted I've used Heimdall 1.4.0 on my mac to install CWM 6.0.4.3 (file name: recovery-clockwork-6.0.4.3-n7100) on my Samsung Note 2 GT-N7100 with android 4.3, the installation went smooth with no issues. 

I then booted in recovery mode (volume up, home, power) and installed the zip file containing superuser downloaded from the link on the google play. 

I then booted my phone normally, and tried if it was rooted with root checker, installed via google play. It says it's not rooted. 

the application superuser starts and gives no errors, 

I've done the procedure several times, also installing supersu, and installing other versions of CWM but I always got the same result. 

What could I possibly have done wrong? and how can I finally get to root my phone? 

thanks,
You are rooted. AFAIK Samsung bootloaders are already unlocked, you only need to flash the recovery to get the "root"

Now for the problem.

Go to settings-&gt;about phone and tap the build number 7 times to enable developer options. Then go to settings-&gt;developer options and there you should be an option similar to root access. Make sure you select Apps or Apps and ADB (recommended) in it and you should have root access.

If there is no such option, download and flash SuperSU via recovery and you should have root access later.

And that addition of "255|" in indicates you being in root user mode and accessing terminal as root. So its a positive sign here as well.

Alternatively, in case you failed to get the root to work, you can also flash 
some custom ROM like Cyanogenmod via recovery.

But rest assured, you are rooted. Its probably some bug and flashing supersu should probably fix it.