I think the best thing to do is to make a time line of your animation and then just guess as to whats going on....do peridodic quick spot renders in the assembly room...and them composite it all together in a program like after effects...this will allow you to correct a lot of smaller errors that you will make. The problem is that you never see the avi texture w/o a render..so make use of that little camera icon in the assemble room....I know it sucks but thats all I was able to figure out :(