I use HS most frequently to move QuickTime movie files that get downloaded with my photos from my Photo folder hierarchy to a separate Video folder hierarchy. I have a search set up that goes through my photo folders searching for the proper file types, and once it's finished, I highlight the files and drag them to the Finder folder where I want them.
With the current version of HS, dragging the files works fine except for the last file, which appears (within HS) to copy instead of moving - that is, if I highlight 15 files in HS and drag them to a Finder window, 14 will disappear from HS (since they are no longer in the search folders), but the last file will stay visible in HS, even though it is no longer present in the Finder. If I then stop the search and re-run it, it will find the single file that appeared to have been copied (rather than moved), but it finds it in its new location, which is outside the scope of the search (the files are moved to a folder outside the hierarchy that the search should be looking at).
This issue also occurs if I move the files between two Finder windows while the search is still running in HS - HS will "hold on" to the last file as if it is still in the original location (within the HS search hierarchy), even though it is no longer present in that location in Finder. Stopping and starting the search via the toolbar button results in HS finding the file it "held onto" in the previous search, but in its new location, which is outside the search hierarchy.
This issue also occurs in reverse - if HS is running a search on a folder with no matching items, and I then drag 15 matching files into that folder, HS will only show the first 14 items, even though all 15 are in the folder when viewed in Finder.
If I then close HS (via Cmd-Q) and bring it back via the menu bar icon ("Bring HS to Front") and re-run the saved search, it behaves as it should and does not find any files outside the proper search folder(s), and/or properly finds all matching files within the search folders.
In doing more testing, I've found that this problem occurred when I moved 15 files, but not 12 or 3 (no idea why). Perhaps it only happens with a certain number of files or greater?
Finally, if a search is left running while files are moved around in the Finder, the "Files Found" count in HS gets progressively more inaccurate. For instance, if I have 15 files in a folder that HS has found in a search, but then drag 12 to a folder outside the search parameters, HS will still show "15 Files Found". If I then drag the 12 files back to the folder HS is searching, HS will say "27 Files Found" (15 + 12), though there are still only 15 files listed.