hello again,
this morning at 2 o'clock, 6 days after placing my bug report, i received a confusing message from "the mixvibes team":
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"...sorry for the late reply!
I have been forwarding all bugs and feedback to the development team and they have been actively browsing the forums to keep track of everything, so they most likely saw this issue already but I will be sure to bring it up with them again. This is very strange and I personally have not been able to replicate the issue of no effects working and no Tweaker in the settings for Cross DJ 4.
Best regards,
The Mixvibes Team"
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As you can see, they "have personally not been able to replicate the issue". Funny, isn't it?
thank you again "discopex" for being much more successful in replicating the issue and thanx to "sfronti", "kelt" and "RoJeC" for proving it as well.