After upgrading the DLP agent to 15.8 MP1, users are no longer able to use the 'Adobe Pro' option from word files. The application works fine if the DLP agent is uninstalled.
Issue is more specific to office plugin (csa64.dll /csa.dll) with 15.8 GA and above. Disabling the office plugin doesn't reproduce the issue even if print channel is enabled.
Release : 15.8 MP1
Component : DLP agent.
A private agent hotfix has been released on DLP 15.8 MP1 to address this issue. If you are experiencing this issue, please contact support for the hotfix.