I’m having the same issue with only the Windows 11 PCs that are using BitLocker since the 15th when that update was applied. KB5083769 does contain updates for Secure Boot for BitLocker… I have a diffrent Win 11 PC not using BitLocker and UrBackup works normally (Client V2.5.29) - has KB5083769 as well.
Clients were V2.5.26 and just wouldn’t start backups since the update. Upgraded to V2.5.29, and now are hanging at indexing. I’ve turned on debug logging and have a log of a backup starting and then sitting on indexing for 8 hours and memory dumps for both the backend service and client itself. Because these are not my PC’s I’ll email the log info to bugreports@urbackup.org
Please let me know if there is anything you would like tested.