Hi Scott,
Have been head scratching myself on this one for a week and no documentation to support or resolve.
Mitel ticket raised and they recommend restarting the Level2 OAI service that corresponds to the PBX such as Level2OAI_MitelDriver.
You can confirm which service is in use in Call Recording admin, older versions used Mitel MutliNode driver.
Even if you got resolved wanted to add this as this is the only thread that appears on a google search for the issue.
Cheers,
Biggie