Lightroom Classic: Slider no visible with large number of images selected

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grid view scroll bar position indicator goes away once a certain number of images is selected.  Inother words, if I'm in grid view and choose "all photographs" underthe catalog tab (522k+ images), the scroll bar is there but no sliderindicator.  If I use metatdata date fieldand click on my earliest year, the slider is there.  As I ctl+click to add subsequent years, theslider stays there but only to a point. In my case, it stays there up through 2012 (~183,000 images).  Soon as I add 2013, the indicator goesaway.  So I then started adding by monthin 2013 and it went away as soon as I added February.  Breaking down February, the indicatorremained until I tried to add 425 images taken Feb 3.  The total thru Feb 2 was 185027 images.  I stopped here because breaking down anyfurther file by file on Feb 3 would be rather tedious and besides, the caseseems to be made.  So is there a limit to number of images selected or is it a bug?  I am in the photo plan so using the latest version of LR classic on desktop, Windows 10 Pro 64 bit.
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John Reed

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Posted 3 weeks ago

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Rikk Flohr, Official Rep

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I have a 385K image catalog here.  I can select all.  When I select all, the slider is initially missing but if I wait about 20 seconds, it appears and functions normally. How long are you waiting?
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John Reed

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That's weird.  I didn't wait that long for the test I ran.  Afterward I set grid view to all photographs under Catalog tab again and went outside to do yard work.  Now it's several hours later and the indicator is still missing.  Of note, when I was doing the test adding and subtracting years, the appearance and disappearance of the slider tab was instantaneous.  So thanks for taking the time to respond but here at least  it would not seem that time waited matters.
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Rikk Flohr, Official Rep

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I am curious if you restart your computer, launch Lightroom and wait a few minutes then select all how long it takes...
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John Reed

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I have just shut down and restarted PC, then launched LR.  It opened in Library module, grid view, Catalog tab, all photographs I assume since that was where it was when shut down.  There is no indicator tab on the scroll bar.  I will check back every so often since I have some things I must do away from the computer and we'll see if it ever shows.
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John Reed

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It's now been over an hour and still no indicator.  Here's another related anomaly.  When choosing "all photographs", since no scroll indicator attempt to scroll with mouse wheel.  A single click on the mouse wheel jumps 10 rows in the grid at the thumbnail size I have set (5 across).  If I reduce the years as noted in my earlier note to stop after January 2012 and now have the indicator in the scroll bar, a single click on mouse wheel jumps 4 rows.  If I select a much smaller, and more normal choice such as a single month or day, one click on mouse wheel moves one row which is what I would think should be normal regardless of number of images being browsed.
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Rikk Flohr, Official Rep

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I've been testing since yesterday and cannot find any issue on 385000 images selected.  The first time after a cold launch it takes about 15-20 seconds to display scroll bar and indicator. After that it is more or less instant. 

This could be an under-speced system, a stressed component (full drive?) or perhaps a problem with a device driver. 

A preference reset would be a reasonable step to take to see if it has any impact. After that, optimizing catalog and the reinstalling Lightroom might be decent follow up steps. 

Reset Procedure:
1. Close Lightroom.
2. Hold down [Alt/Opt]+[Shift] while restarting Lightroom.
3. Overwrite the Preferences when prompted by the dialog.
4. Close Lightroom.
5. Restart Lightroom.
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John Reed

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Many thanks for your efforts and continued help.

Pretty sure not an under-speced system.  It is brand new machine.  Windows 10 Pro 64 bit; AMD Ryzen 9 3900X CPU; 32 gb dual channel RAM; 4095gb NVIDIA GeForce RTX 2060 Super graphics card.

Stressed component I don't think so BUT maybe it could be because the 522,324 images are stored across 3 hard drives, all traditional spinning disks, one internal & two external.  What do you think?  I don't have a lot of choice needing multiple drives simply due to number of images.   (BTW - LR catalog & previews on a separate internal SSD.)

What device drivers should be checked?

I've reset preferences so many times it makes my head spin but I will do it again.  

I've not done a reinstall again due to new machine with brand new install.  But, stuff can happen so I'll try that.