There is actually several topics on the same issue in here, but we never seem to get an answear to when it is going to be fixed. It is actually a very annoying bug.
BTW: I do not own a copy of aTV Flash my self, but my father do. I’m awaiting to see if this problem gets resolved.
I have checked this topic and I have the exact same issues. Very annoying. Its only with external SRT files, embedded are fine (in MKV). I hope this gets resolved soon, you would think that this is basic functionality that should have worked since v0.1beta, but maybe thats just me.
Right now, i cannot advice my friends to buy an ATV and Firecore,since this basic function doesnt work correctly yet.