Ubercart

No, I don't believe those actions are logged in the order log at all (whether the log itself or the comments). You might have to add a line of code to the actual CA "action" to test if the email was successfully sent..

I know that in the default setup, the emails were set to send when a customer completes checkout, but due to race conditions I found that it wasn't always consistently accurate. I did have to set it to trigger of "order status is updated" and the condition was "status is completed", but that appears to be what you've done. Also, make sure you've got it checking the "updated order" and not the "original order" as the original order's status may be Pending, In Checkout, etc.