Answering my own question:
- renamed my photoshop preferences (below file), renamed it in case I needed it back
- <user>/Library/Preferences/Adobe Photoshop CS6 Settings/Adobe Photoshop CS6 Prefs.psp
- closed and relaunched Photoshop and the issue was gone.
While drawing a selection with the marquee tool, the marching ants selection lines aren't showing anymore but do display after I've finished making a selection. They used to display while drawing but all of a sudden stopped.
I've tried the following:
- restarting Photoshop
- resetting the...