Try resetting the browser settings back to default:
https://support.google.com/chrome/answer/3296214?hl=en
here another page with reseting instructions for all browsers:
http://en.kioskea.net/faq/6361-reset-your-browser-restore-your-browser-to-default-settings
I'll be honest, I'm not sure what settings would cause this, but hopefully resetting to default will fix it.