operation failed due to network problem?

Hi guys,

I've developed an outlook add-in in vb6 the gives the users the option to
replace word attachments with a pdf copy of the word documents. After
running outlook for 20 minutes with the add-in on, user who try to send
anything(whether it has an attachment or not) get the following error:

"The operation failed due to network or other communicatin problems. Check
your connections and try again."

I've stepped through my dll in designer mode and watched the send event be
called. The error message comes up after the send event is completed and
before the close event starts. Any help would be appreciated.

Gary