Using DEFRAGGLER in German language I detected an error in the display of "Files in a block" while hovering over the blocks. There are always 51 Files ("Dateien sind im Block") - clicking the block offers the filelist and this shows the real list of files. Switching to English the error doesn't occur, so it should be a translation problem.
I think it's not an important issue but you should know it at least. Thanks for a correction in one of the next versions - btw: I'm using 1.07.124 under XP SP3.