While downloading I often have several hundred posts in the download list. When I find another series I want to sample, I select several, add them to the top of the download list, and switch to the thumbnail tab to see if I want to add this series to the download.
Now using the image DB, after adding them to the top of the download list I have to wait a short time, then reselect the database, and then view the new pictures. Is there any chance of damage to the database by viewing the photos while other photos are being added to it and could this be the reason I see files missing from the database that are on disk as individual files?