Troubleshooting is a process of elimination and you need to determine if the Convenience Rollup or any update is the cause of the problem before blaming them.
For me, you seem to be fixated on the Convenience Rollup without any proof.
I've advised you how I would go about this to find that proof - is there anything else you require help with as I can't offer any more help as you wish to wait on the outcome of MS coming up with answers to what that guy has raised.
