Not true with me.  I sometimes have very long video descriptions and I am not part of a Network.  Nothing changed with my computer except the date - May 1st, 2012.  I had just finished uploading and monetizing a video at 11:55 PM on April 30, 2012 according to YouTube.  Next video finished at 12:46 AM and that is went I clicked Monetize and got the error message.