Problems with subtitles

Hello,
I have a Panasonic gt60, an iMac and the last version of serviio.
I try to watch mp4 and mkv on the tv (via the dlna) and on my ipad through vlc (via dlna too).
I checked the 3 box on the subtitles menu.
Subtitles are in srt format
Subtitles are displayed, but only half a subtitle... More especially, a subtitle is displayed, the next is not, next is displayed and next is not... Only 1 on 2 subtitle is displayed.
When I watch the movie with vlc directly on the iMac, I have no problems.
Could you please help me with that issue...
Thx
I have a Panasonic gt60, an iMac and the last version of serviio.
I try to watch mp4 and mkv on the tv (via the dlna) and on my ipad through vlc (via dlna too).
I checked the 3 box on the subtitles menu.
Subtitles are in srt format
Subtitles are displayed, but only half a subtitle... More especially, a subtitle is displayed, the next is not, next is displayed and next is not... Only 1 on 2 subtitle is displayed.
When I watch the movie with vlc directly on the iMac, I have no problems.
Could you please help me with that issue...
Thx