Same for me. However It shows chart data on UTC+0 but not on UTC+2 which is the data I use without weekends I might add. Data from Tickdownloader. It seems using other data then UTC+0 creates a lot of other issues as well.
It seems this issue is computor dependent. One one computor i can view the trade list and the charts with any data source. On Another one it does not show. Funny thing is that the 2 computors have identicall setups with same evrything including motherboards and version windows 10 version and are using only onboard grafix. I have no clue i even bought a driver update program and updated all drivers but it is still the same. Maybe a java update issue i still have not updated the java on either Machines thought.
You have to check "Store chart data" in Settings -> Trading options to see the chart.