I had a client on Sage 100 2013 with the old Sage Payroll Services. Benefit Mall was involved in the sync process. Because Sage had sold the Payroll Service to someone else, neither Sage or Benefit Mall would support it. I think Benefit Mall did say something like ""Looks good to us."" :) Anyway, my notes are sketchy (from 2014), but the problem in our case was a file missing from the workstation that ran the sync process. My notes indicate it was a Windows file of some kind, but I can't seem to find the name. If you are familiar with FileMonitor, you might try running that while you attempt the Sync process. It may indicate the file it's trying to find. Sorry for the sketchy details. I remember it was a big mystery for us and the solution was quite simple. When I saw ""Benefit Mall"" in your message, it made me want to find you whatever information I could, however minimal.