My laptop, desktop, iphone and ipad are not synchronizing. I cannot find the history from one of those devices on the others. I had set up my home page so that I'd have my history showing up there, but it stopped working. when I ask the desktop browser to send a tab to other devices, nothing happens. This has been going on for weeks. I have tried many things to fix it, but everything seems set to how it is supposed to be. Please help.