Hi,
You can do this in Batches. Create Auto Playlist with criteria from old path and then limit it to 30k at time. Then Select all tracks and do Locate moved tracks. Auto Playlist will exclude already searched files on update.

Please capture this in a debug log (step 4b) and attach the log to a Support Ticket: viewtopic.php?t=86643

This will help a developer analyze why this happens.

I am back again, with an issue that seems to have come back. I have 750k+ files in my database. I have at different times, over the past several months moved some files around and attempted to rescan them and find them on the new drives, but more often than not, it's gets several hundred thousand files in and I get a white screen of death, as it were.

When I hover over the icon on the task bar, I can see the selection window and the properties windows I have previously brought up but it is as if the system just gives up and doesn't ever come back. I am forced to force close and go back several steps to try and get it to work again.

I have the latest MM5 build, am using Win11, latest updates and security patches, latest nvidia drivers, etc.