I simplified the example for brevity, but yes, there is error handling.

And you're sure that the user this code runs as has rights to see all of the entries?

Yes. I'm currently running it as a user who has admin rights in the repository.

I'm trying to reorganize a particular folder structure, so It's walking through all the subfolders in one folder and moving them to a different structure. It successfully moves the folders, but it dies after 789-791 entries. However, if I re-run the process, it will pick up another 789-791 entries, and move those just fine.

Currently I have it running in a while(true) loop, and it seems to happily pick up another chunk of documents each run-through.

Try creating a List<int>, enumerate the folder contents to populate the list, then outside of the using block perform your move operations. The listing might be getting confused when entries in the listing are moved before the enumeration completes.

That's what I'm doing in my example?

Sorry, moving the entries is my end result, but I do collect entry ids and then act on them in another step. The other step is not in question, I'm only getting a limited number of results when I enumerate through the results of OpenFolderListing.

What does it report if you log the RowCount and the length of the resulting list, like this:

var folderList = new List<int>();
       var els = new EntryListingSettings();
using (var caseFolders = YearFolder.OpenFolderListing(els))
{
        Console.WriteLine(String.Format("{0} rows in listing", caseFolders.RowCount));
	foreach (var caseFolder in caseFolders)
	{			
		var caseFolderId = (int)caseFolder[SystemColumn.Id];
					
		folderList.Add(caseFolderId);
	}
        Console.WriteLine(String.Format("{0} rows returned", folderList.Count));
}