No - multiple projections are not the problem, I just changed them to the same one and got the same error. Data is from various sources however, including SDE, but this data has imported in other projects. I will try to create a new MXD and see if that helps fix the problem.
Also - not sure what you mean by "Not an Intelligible log file". I didn't attach anything - I was looking for a log file of some kind. Maybe you meant there wasn't an intelligible log file that exists?