While continuing to poke around with these Bridge problems I encountered a new error I've never seen before (in 20+ years). I had noticed that the NEW Bridge would sometimes regenerate previews as I navigated folders. Not always, and not on all images in a folder. This was a little consistent with ancient history. Updates to Bridge and ACR years ago would sometimes do that - regenerate previews. In fact, there was a time when Bridge/ACR would regenerate previews constantly, over and over again on the same folder. So I tried testing NEW Bridge V14 against OLD Bridge V13 (the last version that worked well). I let OLD Bridge V13 cache a folder of images, then launched NEW Bridge on that folder to see if it regenerated previews. I went back and forth on this, several reps on different folders, looking for a pattern. But I didn't find one. Sometimes NEW Bridge would regenerate previews, sometimes not, with no logic I could see. But then, suddenly, OLD Bridge gave me an error, shown below, saying the cache was bad. I closed OLD Bridge, made a backup copy of my cache, then re-launched OLD Bridge. As promised, it purged the entire cache. Could be a big problem without a backup. My cache is 22 GB, 46K files in 570 folders. It takes hours to rebuild from scratch. And FWIW, all versions of Bridge after V13 ignore the "Generate Monitor Sized Previews" option. They generate 2048 pixel previews in the 1024 cache folder, regardless of monitor size. OLD Bridge V13 correctly generates 2560 pixel previews that match my monitor size.
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