Step to reproduce:
- Create a MBThread with firstname.lastname@example.org user. The thread shows "Test Test, modified * Seconds ago. "
- From control panel, update email@example.com user's first name to "Test 1"
The previous created thread now shows "Test 1 Test, modified * Second ago. "
The user name of MBMessage did not change, it still shows as "Test Test, modified * Seconds ago. "