While browsing folders using Media Browser you may encounter Thumbnail Creation window. It informs you about which thumbnails are being created and saved right now. This is required in order to show SWF movies previews (thumbnails).
Stops thumbnails creation process. Any thumbnails that were not created will be shown as blank in Media Browser. They will be created the next time you visit current folder.
Thumbnails are created only once per folder and this window will not appear the next time you browse the same folder. To optimize thumbnail creation process check out Cache settings. Click Tools Options menu to show Options Dialog. Then go to "Start Up & Exit" section and revise "Clear Up on Exit" option.