What’s this random switch in Chrome?

QRecently, whenever I open a new tab in Chrome a switch appears at the very top left of the window. A part of it is obscured, and it doesn’t have any label that I can see. No matter how much I resize the window I can’t get it to be fully visible. Perhaps foolishly I clicked it to see what would happen but... nothing! I’ve never seen this before. Could it be the sign of a virus infection? Andie Mason

AWe’ve had a few emails similar to yours. This is not a virus but a bug that Google has already fixed. If you regularly close and relaunch Chrome then by now the problem should’ve gone away. If not, restart it now. If the problem persists, then first open Chrome’s menu (three dots, top right), point to Help, then About Google Chrome (see screenshot below). Chrome will automatically begin downloading the latest version of itself, showing a percentage for progress (see screenshot above). When it’s done, click the Restart link.

QI have just been given a pair of Sony Bluetooth headphones. They work fine with my ipad, but when I try to use them with my Windows 10 PC I get nowhere. Instead, I see a message that the computer is searching for wireless devices but that it does not support Miracast, whatever that is. Does this mean that I can only use wired headphones with my PC? David O’dell

AThe Miracast message relates to a moribund wireless-video technology, and is a red herring here – but we'll explain why in a moment. Assuming that your PC does actually have Bluetooth built in then yes, you’ll be able to use your Sony headphones.

However, it’s not a given that your computer has Bluetooth. Most modern laptops have this facility but far fewer desktop PCS do. To check, press Windows key+r, then type devmgmt.msc and press Enter. If you see Bluetooth listed in Device Manager you’re good to go. If not, you’ll need a USB Bluetooth adapter, like the Mpow dongle (around £7, from Amazon www.snipca.com/28570).

Then, try connecting in a different way via Windows 10’s quick-action Connect panel (brought up by clicking the taskbar’s notifications icon, then Connect). Alternatively, pressing Windows key+k looks for all wireless devices, which is why you see a warning about Miracast. So we suggest you focus the search by clicking Start, then the settings cog. Next, click Devices, ‘Add Bluetooth or other device’ (see screenshot), then Bluetooth. Put your Sony headphones into their pairing mode. When their entry appears in the box, click it to connect.