Hi,
to reproduce you need
1. Press Zoom in button twice (Current zoom wiil be "3 weeks")
2. Press and hold left button of mouse on chart and move cursor left until you see two vertical lines without any point on chart. Don't use scrollbars of ChartFX, just only drag chart information to left.
3. As you can see chart don't display rigth points of data.
4, Minimize and maximize application. Rigth points is presents.
Also in attachment you can find screenshots about it.
Attachment here: http://www.yagerinternet.com.ua/download/ChartFxBug.zip