For those of you who are stuck with the 'mcop' problem, instead of creating a directory you can create a link of the socket to the /tmp directory and pointing it to null by typing in a terminal 8) :
You can also create such "links" not only for kde resource sockets, but also for its resource cache (lnusertemp cache >/dev/null) and its tmp (lnusertemp tmp >/dev/null).Code:lnusertemp socket >/dev/null
Hope it 'helps' (even if the problem is indeed resolved with mkdir) .
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