You need at least Internet Explorer 10, or you may want to give Firefox or Chrome a try.
... you merged layer ? when merging layers replay can get lost ...
It was all done in one layer. I have a feeling the video file size got to a point where it was too big to upload. It'll give the message that it's saving, but then always goes to error. I was using SpeedPaint. I found out the hard way about merging layers.