I am having the same problem. I tried the new settings and now my wdtv live hub is unstable (no firmware changes to the wdtv)
Several video files that played normally before now give errors on MC18 (.171).
these are primarily for avi files.
one file for example, is one of my kids shows which a 640x480 data rate of 1163kbps, 29 frames /sec
audio 192kbps 2 channel 48 khz sample rate.
I am unable to find any specific patterns to the files that work and do not work but it is particularly annoying.
BTW, a WDTV profile for the DLNA settings would be lovely,