Every so often when I hover the mouse over the bottom edge of a track header, the cursor won't change from the pointer to the Individual Track Zoom icon. I can sometimes still vertically resize, but it's finnicky -- I have to click on exactly the right spot. Interestingly, the horizontal track header resize icon still appears as usual.
When this happens, I also lose the fade, loop and resize icons along the edge of a region. (I have Fade Tool click zones enabled, and Marquee Tool click zones disabled). I can still DO these operations with the mouse, but it's a bit like running blind.
The only way I've found to get the icons back is to quit and restart Logic.
Has anyone else experienced this? Could it be a video bug? I have a 5,1 Mac Pro with an ATI Radeon 5870 card which I know is a bit long in the tooth. I'm running 10.12.6 and LPX 10.4.1.