Since updating to LR 2015.3 I find that some of my presets don't show up in the Presets panel in the Develop module. Specifically, these are presets that are *loose* in the Library>Application Support>Adobe>Lightroom>Develop Presets folder on my iMac. Any that are within a subfolder show up fine. I just tested this by dragging a group of them into Develop Presets and firing up LR. They did not show up. I then created a folder for them and voila, there is the folder and the presets within it -- and this was without even restarting LR. Very bizarre. So how do I get LR to see the loose presets without putting them in new folders?
iMac 27" 2010, 16 GB RAM, OSX 10.11.2
Presets that are at the top level of the "Develop Presets" folder will appear in Lightroom inside the "User Presets" folder. LR's organization of presets is weak, and this is just one of several quirks.