We notice when the 'sticky bits' for the DX files are updated/get removed, can cause the problem you are having.
To check to see if this is the problem please logon to your EEM server and cd to the $DXHOME/bin directory.
Once there run ls -la and check the permissions and ownerships of these files:
They should read as follows:
-rwsr-x--- 1 root etrdir 2978077 Sep 29 2011 dxadmind
lrwxrwxrwx 1 dsa etrdir 10 Sep 4 2014 dxserver -> dxserver32
-rwsr-x--- 1 root etrdir 3551126 Sep 29 2011 dxserver32
-rwsr-x--- 1 root etrdir 3926473 Sep 29 2011 dxserver64
If the 'dxadmind', 'dxserver32' and/or 'dxserver64' files do not have '-rwsr-x---' permissions or 'root etrdir' please modify them to be as needed. (you can use 'chmod 4750' to modify the permissions to set the 'sticky bit')