Hello. I have a problem with QuickTime player. When I start some movie I can hear only sound but I can see no picture. I have tried with different players but I had same results. I have also noticed that browser have problems with playing QuickTime movies on internet. Any help will be appreciated.
It looks like QuickTime codec is corrupted or missing. This can happen some times, especially if you have installed some other codecs after QuickTime installation (especially K-lite codec pack which has QuickTime alternative. QuickTime will not work if installed on computer with K-lite codec pack). I can suggest you to reinstall QuickTime and your problems with video will be gone.