I've been writing quests for some months now (working around dialouge questing bugs) and I always record silence for dialouge, I am no actor. I record more than enough time for the text to display sometimes excessive lengths and in game its still hit and miss if the text stays on screen long enough or just flashes past. Is there a bug I'm not aware of?

I had this problem, and still do with a couple of lines.

You have to actually record silence. As in plug in your mic, and mute it in your windows settings/turn your mic off. Ensure the ck is using that mic. Then when you record, it will be silence.

On top of that, or if you already do that, you must click the SAVE button when you have recorded your dialogue line.

It's a game engine limitation/quirk. You can workaround it with silent voice files or http://www.gamesas.com/topic/1365775-rel-fuz-ro-doh/page__fromsearch__1.