Good title, eh?  The error message is below but the short of it seems that the little text that reads the used file space at the bottom of the admin file manger (the host file manager works fine because it doesn't have this) is throwing an exception and preventing the module from loading.  Why?  I have over 2 gigs of files in this portal and that is too large for Int32 to be measured in bytes (the unit in the Files table).  Anyhow, I'm off to see if I can fix it.  BTW, this wouldn't be a big problem except it is the only place I know of to set file permissions for various modules.

Error: File Manager is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Value was either too large or too small for an Int32. ---> System.OverflowException: Value was either too large or too small for an Int32. at System.Convert.ToInt32(Int64 value) at DotNetNuke.Entities.Portals.PortalController.GetPortalSpaceUsed(Int32 PortalId) at DotNetNuke.Modules.Admin.FileSystem.FileManager.UpdateSpaceUsed() at DotNetNuke.Modules.Admin.FileSystem.FileManager.BindFileList() at DotNetNuke.Modules.Admin.FileSystem.FileManager.Page_Load(Object sender, EventArgs e) --- End of inner exception stack trace ---