Thanks for the reply.
Yes, the media director was stopped - it was never running in the first place as I don't use my core as a hybrid. The seperate media director was also off.
Now, regarding 32 and 64 bit, a similar thought occured to me. All of my hardware is 64 bit, but I have installed a 32 bit version of LMCE on my core - when installing MDs, do they default to whatever architecture is on the core (32 bit in this case), or will it default to whatever the hardware is? Or does the MD architecture not make a difference to any of this?!?
Either way, I will check later when I get home, and if the MD is set to 64 bit, I shall rebuild it to 32 bit and see if that gives me any joy.