When first launch NT7 Beta 10, chart is completely blank even the title bar doesn't have any info (see attach immage). The work around is to select a different instrument then data would get populated.
I'm running NT7 beta 10 on a machine that didn't have any version of NT installed previously. The workspace and charts were created using this version
First image showed a blank chart when first launched NT7B10. Second image showed same chart with data populated after changing to a different instrument. After data were displayed, switched back the instrument

Comment