Same problem slightly different error:.

System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Entities.Portals.PortalController.GetCurrentPortalSettings() at DotNetNuke.Services.FileSystem.FolderInfo.get_PhysicalPath() at DotNetNuke.Common.Utilities.FileSystemUtils.RemoveOrphanedFolders(Int32 PortalId) at DotNetNuke.Common.Utilities.FileSystemUtils.SynchronizeFolder(Int32 PortalId, String physicalPath, String relativePath, Boolean isRecursive, Boolean syncFiles, Boolean forceFolderSync) at DotNetNuke.Services.FileSystem.SynchronizeFileSystem.Synchronize() at DotNetNuke.Services.FileSystem.SynchronizeFileSystem.DoWork()

I've put up at least 3 posts about it but no replies yet.  I've just about rebuilt my 200+ page  site  trying to find the problem:

Here's what hasnt worked, after each attempt I restore a full copy of the site back to 4.4.0:

1.Tried Recursive Resnych
2.Tried upgrading to 4.4.1
3.Tried manually deleting all db entries for all the folders and resynching (Brought back in the folders but still no subfolders in File Manger even after resynch)
4.Tried  deleting all non essential folders manually then repeating step 3
5. I even tried giving full permissions to Everyone, IUSR,ASPNET, and NET Service for the entire site (just to test if it was a permissions issue)
6. Manually went info DB and change role permissions of all folders to -1

What I havnt tried:

All I've got left is to try a fresh 4.4.1 install and bring over by DB and do a full reinstall of all the modules, skins, etc. I'm thinking I'll wait a week till 4.5 comes out if I'm going to take that path.

Good Luck!

 

I was finally able to recover my File manager through the following method. It still left me wondering what was wrong though. One caveat however... we have a dedicated server so I'm not sure if this will work in a hosted environement,

Make a backup of my complete DNN site via windows
Deleted My DNN install
Installed DNN 4.4.1
Restored the backup copy of the Following via windows

• App_Data
• Portals
• Any Non-Core Desktop Modules
• Any Non Core files in Bin
• web.config file

My question is what actually fixed it. It's not anything in the DB, and its not anything in the skins/portals, its not a file permissions issue, and it's not a module issue (The only module that got removed was Portal Tooltip from BizModules.Net but I don't think that was the issue).

Anyway good luck all

I had a problem with File Manager sync, but with a different error. See my post and workaround here, in case it gives you some clue about yours. Good luck.