Mac OS 10.9.x does not recognizing DJM-250MK2
It was recently discovered that some users may experience problems with some Pioneer DJ software and drivers under certain conditions.
Pioneer DJ is currently investigating this issue to detect the root cause, but there is a valid work around.
Please see the effective workaround from this link.
(DDJ-ERGO is used as an example in the link. You may replace the name with the model you use when you go through the steps.)
