Taurean Mixing
Could it by chance relate to TV's being used as computer monitors? In addition, not using VGA ports but DVI and HDMI?
"If it helps support this idea Im using a 32" Samsung LCD TV for monitor with HDMI" OK so if it helps, this seems to support your idea. I tried out 2017.06 using only my LG 24" computer monitor, through DVI connections on both card and monitor (GTX 960 doesn't have an actual VGA type connector, to try on Samsung 32"). and
I dont have this issue, i.e. pointer functions normally selecting in track number box to highlight track clips. If Im using both, Samsung 32" (HDMI) and LG 24" (DVI) as an extended second monitor, the pointer issue exists in both monitors, i.e., if I move Sonar to display only in LG 24", the pointer issue persists.
Cheers