SPDIF problems help needed.

You will need to assign the desired source in the outputmenu of the Profiler for the SPDIF output and you must use a samplingrate of 44,1 khz for your session. According to your pictures you already set the Fireface to be the sync slave which is correct.
If you just want to record the stereomix from the Profiler including all the effects simply choose Master Stereo for the SPDIF out. If you plan to do some reamping later on you should use Git/Stack which will give you the Stack signal on one of the SPDIF channels and the DI signal on the other. You would then record on two tracks and use one for reference and the other for reamping.
Once you recorded the tracks and want to do reamping you will need to select the SPDIF input in the Input menu to send the signal from the DAW to the Profiler. Of course you will also need to route that signal in your Fireface from the recorded track to the SPDIF output of the Fireface,

According to the Totalmix, the main output is set to -27.2, so, you can't hear sound in your speakers. Do you have feedback of signal in the SPDIF input in the 1st row of Totalmix ? If yes, just raise up the volume of the main output.

Seems like the RME is not receiving a signal on the spdif in. It lists the current clock as "internal".

On my Focusrite Sapphire 6i6 routing software I have to change Internal to SPDIF in order to get the digital signal.

A couple of common issues that you should check out:
1) Is your SPDIF cable working?
2) Have you plugged SPDIF out from Kemper to SPDIF in on the Fireface?
3) There is a section in the options menu for choosing the channels that are active on the Fireface. Is SPDIF disabled by any chance?

Is the green spdif led on the front of the RME blinking, solid or not lit at all? Do you have anything else with coax spdif out, to check at which end the fault is?

Quote from J-War

3) Unfortunately, I'm not able to find something like that " active channel " thingie you're talking about. Could you be more specific please ?

Not too sure about the UFC, but on my Fireface 800, there's a section in the configuration dialog that allows you to specify which channels are active, such as only 1+8 analog, or 1-8 analog + SPDIF.

There are two possibilities I can see here if this has not been disabled:
1) The SPDIF cable is faulty. This seems likely since the UFC is not slaving to the Kemper, which is more of a sign than the fact there is no sound.
2) Your Kemper SPDIF output is not working. I wouldn't expect this from a new machine, but it is a possibility here.

I don't use really high end SPDIF cables with my Kemper, but they work, so I'm assuming that's the problem. Please post pictures of all the pages of your Fireface config dialog so we can see what settings you're using. Cable problem is my bet

Different from my Fireface 800, but I have a feeling we're on the right track. In the settings dialog, under the aux devices segment, there is an option for digital channels and you only seem to have ADAT 1-8 selected. Is there an SPDIF option in there? You should make sure it is activated.

Try and let us know.

What I have when I play the KPA throught the FF UC :

[Blocked Image: http://photos13.free.fr/KPA_FFUC/Capture_KPA_FFUC.JPG]

[Blocked Image: http://photos13.free.fr/KPA_FFUC/Capture_KPA_FFUC_2.JPG]

And when you click on the Master button (up/right of the KPA), go on the last page in Outputs AddOns and check the S/PDIF volume.

Good you were able to do this kind of special troubleshooting.