Each version of a new operating system comes with its own set of backwards compatibility issues and Windows 10 is no exception.
The transition from Windows 8.1 to 10 is far less jarring than the move from Windows 7 to 8 was, but there are still certain applications that can become broken and, in some cases, cease to work at all.
One such application is Chrome, which some users have even had to fully delete and reinstall. If a program isn't working with Windows 10, try looking in the Windows Store for an update and, if that doesn't work, delete and reinstall it.
Over time, more and more developers will get round to updating their programs for Windows 10 so, if you're reading this a few years from now, this likely won't be much of a problem anymore.