ThumbsPlus displays this dialog box when doing something that may take a while. Errors and messages show in the Messages area. For most operations, a Cancel button is available that will cancel the operation in progress. There is also a Background button that will minimize ThumbsPlus so that you can easily switch to another application. The title bar shows the activity in progress; directly below this appears additional information about the progress, such as the current folder or file name. There is also a percentage complete indicator (both numerical and graphed).
To receive more information about any error in the list, select it and then click the Help button or press F1. The error codes are also listed in this document.