Wrong results returned with Sharepoint Client ObjectModel

I'm using the sharepoint client object model for a small application. When I try to get all folders and items from the "Shared Documents"-library, it doesn't return all folders and files.

Code:

  private void SearchFolder(ClientContext context, SP.Folder folder, SP.List list, int niveau)
    {
        SP.FolderCollection collection = folder.Folders;
        context.Load(collection);
        context.ExecuteQuery();

        //Search subfolders
        foreach (SP.Folder tempFolder in collection)
        {
            string tempFolderNaam = tempFolder.Name;
            SearchFolder(context, tempFolder, list, ++niveau);
        }

        //Search this folder
        SearchFiles(context, folder, list, niveau);
    }

I call this method with:
SearchFolder(context, list.RootFolder, list,0)
So it starts from the rootfolder and should get all (sub)files and (sub)folders

I've got 10 folders in the rootfolder and 1 subfolder in the first. It only returns 5 (4 are ok, one is "Forms"-folder)

Is there something i'm missing/did wrong? Or is this a bug?

Thanks in advance!