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Where are your photos located? Internal drive or external drive. If external drive... is it connected? Can you upload a screen shot of the entire library window.
Can you see thumbnails in folders with less images?
Have you moved or renamed your previews.lrdata file?
Can you upload a screen shot of your Lightroom folder?
Thanks so much for answering so quickly, cmgap! I'll get a screenshot tomorrow.
Photo location: all are stored on an external LaCie drive array (with 5 drives inside) that is formatted to Raid10, and is connected persistently via Thunderbolt 2 (it's a massively fast connection and that's the fastest RAID version available).
Photo collection: it's huge (over 1 million), formatted as many subfolders under only 1 drive volume on the LaCie (and there are about 10-15 "root" folders there representing each program/department that the photos represent). They're all on that blazingly fast LaCie array, the LaCie is always connected and always on. The previews file and catalog file remain persistently stored on that same external drive, but again I never disconnect or move that drive at all.
As far as computer specs I have 48 gigs of DDR3 Ram, and the AMD Radeon HD FirePro D300 built into my Mac Pro trash can has 2gb of video RAM.
Now, per the Adobe Support twitter account, I have disabled all graphics card acceleration - and this DOES seem to have helped somewhat. I will update soon when I use it more. (But also why would disabling graphics card acceleration help when I have 48 gigs of RAM?)
On a general note, my inclination would be that thumbnails in any given folder are supposed to load when you access the folder - but that's the behavior that isn't happening. It didn't seem to be "thinking ahead" at all when I'm scrolling through folders that are the only folders being accessed in the Library window.
What size previews are you generating in Lightroom?