The Explorer browsers will sometimes flicker black lines in the panoramas if you hit the refresh button or go back to previously viewed panoramas. You'll have to quit Explorer to clear the problem. QTVR Quicktime VR panoramas are also made available. Quicktime VR panoramas are high quality panoramas that require the free quicktime plug-in. Get Quicktime software free from Apple Computer.
Quicktime panoramas are often smoother and can include sound and other features.