1. Start a preview of a tease with a visible timer. (I also had some custom buttons, but don't think they're relevant).
2. Move your mouse over the 'Reset' button. Make sure you move it across the button boundary, i.e. over the button, then outside the button, then over, etc.
Expected results: not much
Actual results: The timer 'pie' in the bottom right hand corner resizes itself. Sometimes it becomes bigger, sometimes smaller.
Jap, that bug is a true classic. Nobody knows why it happens or how to fix it, but I'll put it on the list and we'll take another look in due course. Thanks for the report!