I have been using the Multicamera to mix two or three camera videos for the past few months.  Last week I lined up my videos and hit select all and went to Multicamera and clicked on it and nothing happened.  All I get is "Not Responding" and then nothing ever happens.  I have downloaded 8c, and loaded that, but still nothing.
I'm using a dualcore processor with 4gb of ram and Vista Ultimate.
Any Ideas?