Object Reference errors are showing up in the DNN logs. If you attempt to access a folder at the download.aspx address you get an error.
For example,
http://www.roguewave.com/...oad.aspx?entryid=951 951 is actually a folder.
Accessing via a DMX page gives you the folder as expected, no error:
http://www.roguewave.com/...nts.aspx?EntryId=951 or (admin required):
http://www.roguewave.com/...ult.aspx?EntryId=951 This only seems to apply to folders. If a File EntryId is not found, the expected 404 page is returned.
Here is the full stacktrace:
[NullReferenceException: Object reference not set to an instance of an object.]
Bring2mind.DNN.Modules.DMX.Services.Storage.StorageProvider.InstanceByProviderId(Int32 ProviderId) +458
Bring2mind.DNN.Modules.DMX.Download.ᜂ() +9075
Bring2mind.DNN.Modules.DMX.Download.ᜁ(Object A_0, EventArgs A_1) +234
System.Web.UI.Control.LoadRecursive() +70
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3177
Note, you will only get the friendly error on the live site, so I included a dev site screenshot:
http://prntscr.com/rlpzi