Hi -
Do you mean the Scene Trigger arrows? I played around with it for a while but I can't duplicate that issue here -- they're always available/working; a search didn't turn up any other reports of this either. In case it's a bug or momentary glitch, I'd suggest trying the usual troubleshooting steps, including doing a hard computer shutdown/restart, and trying the same thing in a fresh Logic Project..
I don't see any key commands listed that could cause that, but in case there's some setting I'm unaware of I've attached a Live Loops course to this thread -- maybe you'll see something in there that might shed some light..
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