if you are installing version 14sp1, install the original release of 14 and then convert then install sp1. Version 14sp1's conversion may have an issue.
If a system has the ADS server and multiple version of Medisoft, a dll mismatch may be occurring. The Mismatch may be hidden. Try converting the data on a machine with one version of medisoft or use the single user version of Medisoft and turn the ADS off.