I am also seeing this bug (since Trusty), and it's quite annoying! The duplicated bug describes it better. When the application loses focus, the scrollbars turn gray, sometimes. When it regains focus, sometimes the scrollbars stay gray.
This is a big usability issue, because a gray scrollbar on a white background is hard to see. It's even worse when the background is also gray (like in the Software Center). It's also ugly. Could someone look into this? This report seems forgotten (the last message was in April). -- You received this bug notification because you are a member of DX Packages, which is subscribed to overlay-scrollbar in Ubuntu. Matching subscriptions: dx-packages https://bugs.launchpad.net/bugs/1310356 Title: Grey trace beside the scrollbar Status in Overlay Scrollbar: New Status in “overlay-scrollbar” package in Ubuntu: Triaged Bug description: Some times appears grey traces beside orange. It is reproduced in many ways, for example after minimizing app. This cosmetic bug appears since Trusty. To manage notifications about this bug go to: https://bugs.launchpad.net/overlay-scrollbar/+bug/1310356/+subscriptions -- Mailing list: https://launchpad.net/~dx-packages Post to : dx-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~dx-packages More help : https://help.launchpad.net/ListHelp