We are currently on GW Mobility 14.2.1 build 237

I have users reporting the following issue: When the try to reply to a received message on their device they receive the following error:

Message is from: Mobility
With the subject line: Failed to Add Item
And the body: Mobility failed to add the following item because: Bad parameter. Internal error

The users can read messages, move messages, and compose messages, but not reply.

When I look at the admin console, the users show as:

User State: Synced
Device State: Normal (with a green check mark)
Last Sync: current

Also, we are on GW14.2.1.

Has anyone else seen this?