It's probably just maintenance, and nothing else to worry about. It happens from time to time.
Harshy, there are no ads at all. During the one (maximum two) ad breaks withing the confines of a thirty minute bulletin, the Thai version shows a still screen for UBC (???) - some local broadcasting company, with gentle music played over it. Then, it eases back into the BBC World bulletin seamlessly, without all the hitches, jumps, fits and starts that I am normally used to witnessing. The whole handling of timing is far better than usual.
The exit from the bulletin to the still slide is also done very well.
James
Thanks for that BBCWORLD, yes I had a look at UBC's site, they look a professional company too.