Apologies if this has come up before, but I could not see it.
If I run a binary logistic regression using the "Binomial Logistic Regression" from the "Regression" tab I get different results to an analysis run using the "Generalised Linear Models" from the "Linear Models" tab (choosing latter case the logistic regression option).
My model has a 0,1 dependent variable, one factor, and two covariates. SPSS gives results more in line with the former analysis (although numbers still rather different from both).
It doesn't look like a type I/type III sums of squares-type issue, but...