The latest update to SourceTree 1.8 is a huge disappointment. Aside from the missing colors in the toolbar icons already mentioned in two other tickets (
SRCTREEWIN-4273 and SRCTREEWIN-4278) the repository list to the left side is extremely narrow now and thus barely usable.
It's also missing icons & colors which made it very easy to see states in the previous version.
For now I've downloaded version 1.6.0 and performed all updates within 1.6.x to get back a usable version.