XKit Itself

• A refreshed set of user interface items, called Refresh7, with a more colorful and flat appearance to fit the new Tumblr design.

Bookmarker

• Your bookmarks are now synced with XCloud.

Post Crushes

• Works with the latest Tumblr changes.
• Better custom URL handling.

Mute

• Fixed a bug that might cause muted people to appear.

You can wait for about ~45-60 minutes for XKit to update itself, or go to XKit Control Panel > Other > Update All to get the updates now.