Trouble burning blu-ray

Is there any way you can help me to burn my movie files to Blu-ray discs under Yosemite?

Ever since OS X updated to Yosemite, I can not burn my movies on blu-ray discs any more to store and share and view on TV. Final Cut Pro X no longer recognizes any brand new blank Blu-Ray Discs. What a Pity!

I have beautiful movie files created using Final Cut Pro X waiting to be shared with people and play on TV. Right now, I can only use hard drive to SHARE master file, .mov file... I can still burn to DVDs. However, the movie quality is so terrible compare to Blu-Ray HD quality.

PLEASE HELP!!!!!!!!!!