RGBW Associations

[rhalbheer 5]

I migrated my HC2 to HC3 this morning. It kind of went OK except for the RGBW Controller. When they are migrated a lot is missing, especially the associations. 

In one room I have two controller, one being the master, the other one the slave for all (on/off, colors, brightness etc.). 

I cannot make this work the slave completely ignores the master and I am fighting this for a day now.....

So, the master is configured like this:

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and 

 

And then the slave is configured the same way at the General tab, in Advanced I changed Paramter 6 to:

 

And finally, in the Associations of the slave I added the master. No matter to which group I add the master (2-5), nothing happens at all when I switch the master on.

Does somebody have an idea what I do wrong?