I can turn on Live Preview Tracking, but it does not update frequently. There is no longer a UI control to set the update interval, so I can't tweak it to see if the behavior changes. There seem to be several issues:
1. When Preview By is set to Layer, it does not update for every layer. I saw the display jump from 27 to 29.
2. The layer number / Z value in the Preview panel can get far ahead of Z value in the Machine Control Panel. I observed Z in Preview stepping up 25 seconds before Z in MCP. I realize there can be buffering in the printer, but that seems a lot. The release announcement said the coordination had been improved... seems to still be an issue.
3. When Preview By is set to Lines, it does not update very frequently. I observe that it stays at the same line number and the graphic does not update, for about 2 minutes. The Lines update does *not* seem to be related to when the Layer changes (i.e. when the Z value jumps). So at this point the Lines preview is not usable.
I'm running 5.1.0 on MacOS Ventura 13.3.1. I'm controlling a Robo3D R1+ over USB.
As others have stated in other posts, the Live Preview Tracking is an important part of our print job management, especially for manual filament changes etc.