When you select this option, ThumbsPlus examines all files in the current folder and any of its sub-folders.
While running, a progress box displays which indicates how much of the work is complete. This progress indicator is based on the total space in use on the drive, and is updated by the size of each file as it is examined. Since graphics files are usually grouped together, and different types of files take various amounts of time to analyze and reduce, this indicator does not really indicate the amount of progress made in time, but only how far through the disk ThumbsPlus has looked.
When running ThumbsPlus in multi-threaded mode, a scan task entry with progress indicator displays in the tasks window. You can click on this scan task entry and then select Image | Tasks | Quit Task. If any errors occurred during the thumbnail scan, its task entry will remain in the task window. You can then double click on the task entry to review the errors that occurred.
If not running in multi-threaded mode, a modal progress box will be displayed during the scan. You can click Cancel in the progress box to quit making thumbnails. This progress box also contains a list box containing any errors that occurred. These errors include the file name being thumbnailed at the time of the error. If any errors occur, the progress box will remain until you click OK.