The site was just upgraded to DNN 08.00.02 and a brand new install of DMX version 6.1.13 was added after the upgrade. I already installed the patch for DNN 8, but it didn't correct the issue. When attempting to add a new folder, the following errors appear in the event viewer:
1. The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.
2. Can't find upload provider silverlightuploadprovider. Inner Msg: The given key was not present in the dictionary.
3. Value cannot be null. Parameter name: format