id	summary	reporter	owner	description	type	status	priority	component	version	resolution	keywords	cc	blockedby	blocking	reproduced	analyzed
1722	PGS subtitles vanish/disappear immediately in m2ts	skank		"PGS subtitles vanish/disappear immediately after shown.. in m2ts files..

This is quite an urgent problems as none of the blurays with it, play subtitles well..
Its only an ffmpeg issue cause the same thing plays well on powerdvd, Total media theater, MPC-HC ,...
To test, you should use xbmcplayer or VLC player (as both are using ffmpeg) not something else

Sample file: 
http://dl.dropbox.com/u/103661855/Sample%20of%20Subtitle%20Issue-.m2ts
"	defect	closed	normal	avformat	git-master	fixed	pgssub				1	0