Symptoms for this case include logging into Encompass and getting messages that there are Documents that need to be attached, or the Background Attaching dialog box is backed up and there are consecutive failed conversions.
Close Encompass and delete the following folders found at this file path: C:\Users\username\AppData\Roaming\Encompass
(Replace username with currently logged in user's Windows profile name)
(If AD joined PC, also delete these folders off of user's profile on Virt1)
Restart Encompass, folder will auto generate, and queue for Background Attaching dialog box will be empty.