Yesterday I did the Update from Traktor Pro 3.5.3 to 3.6.0. When I started Traktor 3.6.0 I've found that my old Audiointerface Audio 4 DJ will not be recognized.
Have you also updated your operating system? The Audio 4 is unsupported under Windows 10, and any version of Mac OS past 10.11.
Yes i have, but it hast worked with Windows 10 until the Traktor Pro 3.5.3 Update.