Official comment
@jnikken > The only CFX which have ever been post-fader are SPACE and DUB ECHO, as those are the only two with tail-out / reverb.
Since I recently updated to rekordbox 5.1.1 the release FX are no longer post-fader, and only some of the CFX are. For instance, dub echo is post fader, but jet & sweep are not.
I did not have this problem in previous versions. I'm using a DDJ-RX on MacOS-X.
@jnikken > The only CFX which have ever been post-fader are SPACE and DUB ECHO, as those are the only two with tail-out / reverb.
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@jnikken
Sorry to hear about these issues.
Could you tell me the details??
■About Release Fx
Sorry, we can't reproduce your problem.
Release FX seem to be working as "POST FADER FX".
■About CFX
You are right, JET / SWEEP work as "PRE FADER FX" since Ver4.2.2.
Which version does not cause problems?

Excuse the small text, when copying from word this forum won't allow me to edit my text.