Message:

An error occurred trying to load speech files. Speech functionality will be
disabled:

COM returned an unexpected error code: Details are The parameter is incorrect.
(ERROR_INVALID_PARAMETER, 87)

On login, the following message displays:

This indicates a mismatch between the version of Dragon installed on the workstation and the language model selected in RadPortal.

To fix this issue, reinstall the correct version of Dragon or change the language model selected in RadPortal for the specific user.