For about one month I have had great difficulty playing Fiddlehed MP-3 tracks, which includes all play-alongs as well as practice exercises. The tunes coming through on You Tube are fine, so I get the lessons on new tunes. IO have a Mac pro Book that I have had for years. It uses Quick Time Player for AV. I tried to change to VLC to no avail. Tried changing server to Safari from Google Chrome. it worked for onem day then stopped.Any ideas, solutions??