Assuming you have correctly used Shotcut to generate videos in one of the allowable ( .ASF ,  .AVI ,  .FLV ,  .M4V ,  .MOV ,  .MP4 ,  .MPEG ,  .MPG ,  .QT , or .WMV ) edTPA file formats, it is possible that these videos may play fine within the Shotcut program, but not in other video players on your machine.  Playback problems might include a completely black playback window, a completely white playback window, or no sound.  There is no guarantee that the player you are trying to use is capable of playing the particular video file type you created in Shotcut.

In order to determine whether the problem lies with the video files or the player, it is necessary to download and install a video player that is capable of playing virtually any video file type.  An excellent example of such a program is (the free)  VLC Media Player .  It can be downloaded from:

http://www.videolan.org/

After you have downloaded the program, run it to install the player on your computer.  Then, try to play the problematic videos in the VLC player.  If they play properly, it is likely that the video files are not at fault, and the problem is with the particular player(s) you were trying to use.  If, on the other hand, the videos did not playback properly in VLC, there is most likely a problem with the files themselves.  If this is the case, reread the appropriate instructions on this page  (or rewatch the relevant video(s) under the  Workshop Videos  heading on the home page of this site) before attempting the editing procedure again.