I'm new to Apple Mac so apologize in advance for using incorrect terminology. Since yesterday when I signed on to OkCupid, I'm getting what I believe is Apple's "hourglass" icon (round various colored circle) which I can't get rid of (and can't do anything) until I shut down and restart computer. It's happened today on other sites as well. It takes over my computer. Is this a virus? Does anyone know, and if so, how can I get rid of it? Thanks for help.