We need to put the troubleshooting information together...
1. What version of Premiere Elements, what computer operating system?
2. It sounds like you are in the burn to disc Blu-ray and you are using a 25 GB disc. If that is right, what does the burn dialog show for Space Required and Bitrate (with check mark next to Fit Content to Available Space)?
3. Please confirm where the 98% stoppage is occurring
Burn to disc
4. Are you using Timeline markers and disc menu in this project? Do you have the same problem with and with the Timeline markers and disc menu?
Let us start here and then decide what next.
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Please try again as your time permits.