1.17.26 has been released! This is the first release candidate (RC1) in preparation for the planned release of 1.18.0 in March, and as such it now points to the 1.18 add-ons server instead of the 1.17 add-ons server. For add-on authors, now is the time to start uploading your add-ons so they’re available when 1.18 is released!

For obvious reasons this release contains only fixes, most notable among those being a fix for units disappearing or flickering when the attack dialog is open and a fix for the Skip Animation button vanishing when watching a replay.

For more details, as usual see: https://r.wesnoth.org/t57624