Hi Rich,
After updating to version 17.0, I went to Apps > Maintenance / Check for updates.
The gtk3.tcz extension wasn't updated.
The libXdamage library wasn't in the list of dependencies.
So, I added .old to the 3 files gtk3.tcz, gtk3.tcz.dep, and gtk3.md5.txt.
Then I downloaded and ran gtk3.tcz (maybe there's a command to force the download and run of an existing extension, but I didn't find one

).
The libXdamage library now appears as a dependency.
For me, the ticket is resolved (subjet up-to-date).
Thanks.