You can't use subtitle button because as Shagrath said, PS3 don't support subtitles when streamed.
If you need subtitles, you need go to TRANSCODED folder where you have option which audio and subtitles to play. Not possible to use audio/subtitle button on PS3 remote but you need to choose only one combination from list.
If you do it, PMS will transcode video picture and burn subtitles to it. It means SUBTITLE button will not help you
Also if you need set combination of audio/subtiltes: en,on,nor,on
You are from norway, your second language is english. So your priority is NOR audio without subtitles. If NOR audio not present, then ENG audio, NOR subtitles, if NOR subtitles not present, then ENG audio and ENG subtitles. If ENG nor NOR subtitles present, you need to disable subtitles. If ENG and also NOR audio and subtitles not present, then play any audio without subtitles.
Now see correct one but beware that DVD language tags are 2chars instead of MKV idlang which are 3chars. So best priority line will be:
Don't know if "NO" and "NOR" are correct lang tags for your country but hope it is clear how to create AUDIO/SUBTITLES priorities.Question to Shagrath:
When Haali format is written in line for AUDIO/VIDEO priorities, what about separate AUDIO and SUBTITLES priority lines? What is its purpose when Haali format is used?
I deleted them for sure and left only Haali AUDIO/VIDEO line and it is working fine:-) But I am not sure if in some situations empty audio and video priority lines will not mess my Haali priority settings...