Hi I run and manage about 15 sites in SilverStripe and I've noticed a pretty glaring error that occurs occasionally in the newest release. On two of the sites, our content managers were having trouble reordering pages/data objects in SilverStripe. When they'd reorder the pages, they'd get an "error saving sort order" flash at the bottom.
I investigated the issue and the ajax response header is just a 400 bad request error. If I put ?isDev=1 at the end of the URL, I was able to reorder the pages just fine, this leaves me to believe that something is up with the session data/admin rights?
Rolling back to 2.4.2 also solved the issue for one of the sites.