TNG USD failure creating several jobs together

Has anyone ever had problems creating several jobs in USD on a W2K machine. The error would seem to be related to the fact that One job has been set up with a number of installations and the second job is created before SDO has finished creating all the stuff in the activate area. One of the jobs quite often has problems of the type "application initialisation error" often cazipxp but also USD specific processes as well. Allowing time between job setups seems to alleviate the problem but its not allways 100% with multiple users working on the system. It seems likely to be some sort of environment/or usage type issue but where do you start on something like this.