Getting Failed to build patch on SVN checkout

Caused by: jetbrains.buildServer.vcs.patches.UnsuccessfulPatchException: Failed to build patch for build #1.1.42 {build id=80490, buildTypeId=Dashboards}, VCS root: "BUILD-SVN" {instance id=12, parent internal id=3, parent id=build_svn, description: "svn: https://.../root/"}, due to error: Cannot build server-side SVN patch: svn: E204900: Access is denied

TC + 3 agents are all running on the same windows server along with the SVN repository so its a local checkout. I can login and do the same svn checkout no problem. Multiple projects share the same VCS root and not all of them fail.

I've also noticed that the File content replacer script which has been running flawlessly for years has now started to intermittently fail on 1 sometimes 2 random files of 95 file updates. It's updating the version info in AssemblyInfo.cs.