Thanks for the reply,
Yes I do have SP1 installed, I'm in the process of downloading SP2 and SP3 now, just trying anything I can really.
Any tips other than trying service packs (I had a skim read through the descriptions of the service packs and did not see any references to equations)? I should know in 20 minutes if they help at all.
Cheers

UPDATE:
Service packs 1, 2 and 3 are all up to date :/