I have managed to burn 3 coasters with version 2.5.3.0 on my PIONEER BD-RW BDR-203 FIRMWARE 1.10(SATA).
When I looked on the coasters I was amazed to see about 5-7 gaps in the burning on the media !
I was burning straight from an hard disk... one directory in a size of 25 GB.
Media used is RITEK BD-R 2x speed.
When I changed back to 2.5.2.0 problem disappeared, and no gaps on the media !
Please fix !