BUG: LR 7.4 "Custom Order" in a Collection become random order

Hello Art,

The first stop would be to install Lightroom Classic CC 7.5 which was released this week. 

If you are still seeing the issue after installing, we would need additional information from you.

• Complete System Information including OS and version.
• A set of steps that will reproduce the problem for you that you can share with us so we can attempt to reproduce ourselves. 
• Screenshots of the Grid view of the collection in both the before and after befuddlement state. 
  

That should tell us a little more about what you are seeing and hopefully we can either reproduce or get your system functioning as expected. 

Thanks for the response.  It is wonderful to have this kind of rapid support.   I do have to wait a few days before installing any new version of Lightroom, to let things sort out. 

Before I do all the things you request, could I ask that you (a) open Lightroom, (b) take a collection that is sorted by filename and/or date/time, and then move just one photograph to a different location in the collection.  That will cause it to switch to "custom order" (as it should).   Then (c) see whether other photographs in the same collection suddenly all change order randomly as well.  

Just try it.  It should take one minute, much faster than all the things that you are asking me to do.  

Thank you.

ps:  2015 MacBook Pro 13" maxed out, all software are most current versions except perhaps for Java and Adobe reader (because I can't tell whether their upgrade prompts are real or phishing).  And Lightroom Classic CC is v7.4.

I had already tried it but I did so again. Nothing unexpected happened with the order of the non-moved photos.  Question for you to ponder: Are any of these photos involved in Stacks in any way? Stacks that might have constituents outside of the collections?