We are unable to reproduce the issue. Kindly create a fiddle so that we can help you out. Hope this link helps you for more information on creating dynamic charts.
Ethoel,
Its not possible to implement gann angles in candlestick chart. You can create two charts, one with candlestick and other with gann angles to achieve this. Here is an example.
When its date-time axis, the date-time values of JavaScript will be in milliseconds starting from 1 Jan 1970. You can convert it to date-time and set it to viewportMinimum.
We were not able to reproduce the issue yet on Win7 + Chrome 49. Does your system have any graphic card installed? If yes, which model. Also, can you try restarting the machine once and see if it is still reproducible.