It seems one is simply comparing levels of the within subjects factors and the other the between subjects factors, but what analysis is being run in the within subjects contrasts - some kind of paired t test?

SPSS does not give so many options in the contrasts tests (e.g. repeated, polynomial) in comparison to the post hoc comparison tests. Another niggle I have is that SPSS does not give ALL the possible contrasts. It would be useful to know how to produce a table of all possible contrasts...

Thanks for your help!