When attempting to empty the EndNote trash - the trash would not empty. We figured out that it was because the citations were being used in the Word document. After deleting the errors in Word, the trash emptied because it was not in use.
The third problem - was that the student's EndNote library got locked for some reason. The research on correcting that problem was to restart the computer. As challenging as issues such as the three I just discussed - it is rewarding to learn new tricks.