A recent Chrome browser update has changed the 'Share' button from blue to grey. This was a change made by Chrome and unfortunately Netop does not control this dialog box.
Chrome version 71
Chrome version 72
This does not affect functioning of Vision for Chromebooks, students will now have to actively click 'Share' as opposed to hitting the 'Enter' key because the default selection has changed from 'Share' to 'Cancel'.
If you have questions or concerns about this, please contact Support.