Speed Dial thumbnails are black (Windows)
This issue has persisted since version 2. No matter what you do, the previews stay dark. Using latest 3.x at time of writing.
@uuseri May be hitting F5 on Speed Dial helps.
May be a GPU incompatibility.
Try to disable Hardware Acceleration in Vivaldi.
Open Settings > Webpages, untick "Use of Hardware Acceleration" and restart.
@Gwen-Dragon These don't help. Found this guide https://forum.vivaldi.net/topic/10388/refreshing-or-cleaning-your-profile A new profile creates thumbs, gonna start using it as soon as I figure out how extensions can be brought back to the new profile.