@planterguy
Yes, that is why I suggested in one of my last posts that perhaps the vendors were not staying logged in due to an ssl issue. Then you said you were not using SSL…
If they are not securely logged in in the first place, this can happen (make sure they login using the my-account page)
Secondly, install Really Simple SSL plugin, and see after running through the options, if that takes care of insecure SSL content on the site that can create these issues.