Thanks for your question and sorry that you are having this problem.
Please could you give a bit more detail about the issue. Do you get an error message at all when uploading to YouTube or do you mean that the video uploads but does not play or is corrupted in some way?
If there is a particular scribe that you are trying to upload, please save it to your online directory (cloud icon), let us know the name and we can take a look for you.