Honestly, I’m surprised you didn’t rip a hole in the space-time continuum by bringing swf files into AE! haha. That usually creates all sorts of problems, that’s if AE will even take them in the first place. First thing to do is convert them to an edit-friendly format (not h.264, swf, etc.). But to your question, “what am I doing wrong”, aside from the swf files, it’s hard to say since you haven’t really told us much about your render settings or anything. Are they set to full resolution in the render queue? The formats AVI, quicktime and blu-ray don’t really tell us much since there are all sorts of options within each