i think you changes from a single ~/.cedit/ color file to a multiple system with many includes in the main file.. the problem is, that you forget to pack those files into the rpm :( .. -> the colour definition files for cooledit (mcedit) are missings and produce ugly error messages when editing files.
As a temporary fix, one could copy the missing files from the source rpm included on the second CD of the official 6.0 set.
I can't reproduce this problem with the latest mc package (mc-4.5.38-1), and there are a bunch of .syntax files included in the package, so I am assuming it was fixed.
*** Bug 2996 has been marked as a duplicate of this bug. *** Syntax highlight rules are missing in binary rpm. should be in /usr/lib/mc/syntax directory. avail. in src.rpm