FX Channel selection button not working on my S4

[Leodido]

Hi, I noticed that the FX Channel selector buttons don't work anymore on my S4. The button you press on any channel to select which effect banks you want to use for this one isn't doing anything anymore. Is that a known issue? Is there any workaround?

[basspenetrator]

normally you can only choose one FX unit per deck, if i'm right..
try using this:
http://traktorbible.com/freaks/mappingview.aspx?id=106