Just to clarify: are you using a (single) left click or double click to select the track?
If it's a double click, check
Preferences > Mouse Modifiers for [Track control panel].
Quote:
I just upgraded to 6.12c using default 6 Theme
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What operating system (Windows, macOS, Linux) are you using in this case?
EDIT: Or do you perhaps have a script set up as SWS Startup Action (
Extensions > Startup Actions > Show Project/global startup actions) which might be causing this?
As example, something like the
'mpl_Enlarge selected track' script mentioned in this thread:
https://forums.cockos.com/showthread.php?p=1725960