found portal, would like an end-screen.
Cool! What do you mean by an end-screen? Can you be more specific for us?
after going through the portal only a black screen was the result.
Really?! I'm going to have to check that out! There's suppose to be a line effect with credits that fade to black over the course of a couple of minutes... My apologies if there's a bug there.
Just tried it again, and there were full credits before fading to black. I am really sorry that it didn't do that for you... Not sure how easy it would be to debug this issue, but I'll do what I can!