Many subtitle files use the italic and bold tags to distinguish the translation of written text, character's thoughts, movie title, loud voice, ... However webOS doesn't support parsing of these tags and it just shows them on the screen as:
<i>This text is italic.</i> <b>This text is bold.</b>
The workaround is to Find/Replace all occurrences of <i>, </i>, <b> and </b> with 'nothing' but, of course, that removes the subtitle formatting :-/
I hope the <i> and <b> tag parsing wil be implemented in the future firmware releases. In the meantime at least ignoring of these tags would be fine - so everything inside '<' and '>' would be ignored (including the brackets, of course).