Seems to be (mostly) working here. Does it work with the most simple patch? Did you try to trash Max Preferences?

Preferences are stored here:

~/Library/Preferences/Max5 Preferences Folder

-Ben

Thanks, I gave that a shot but still no luck. My graphics card has been acting up lately so that could be a clue. I tried it on a simple jit help patch and it wasn't any different..when I hover over patchcords the probe just shows n/a for all of it's values.

One thing to check is to make sure that you have the jit_matrix-probe.maxpat in Max's search path. It is installed here:

Max5/Cycling '74/interfaces/jit_matrix_probe.maxpat

If you don't have this floating around somewhere, best to do a clean install. To clean out Max 5 entirely, remove these items:

~/Library/Preferences/Max5 Preferences Folder /Applications/Max5

Then download and reinstall Max 5.1.5:

https://cycling74.com/downloads

Yeah it's there. I mean..it opens and everything just fine..it just doesn't work like it used to on my older macbook. Isn't it's operation just to show in it's screen what is currently passing through the green/jitter patchcord you're hovering over with your mouse? No watchpoints or anything need to be set etc

I'll give a re-install a shot I guess...

Man...this is one of those stupid answers. Somehow I had disabled 'probing' in the debug/preferences and of course that turned off my matrix probe..now since I've turned it back on it's all good...haha