Unfortunately you are beyond my knowledge set on this issue. I would strongly suggest contacting support and asking to speak with someone in second level support to make sure you get the information you need.
The instructions provided in the link for our machine type simply explain how to set up the printer from scratch using the driver from the fiery. If I am already using the driver from the fiery then I don't see how this will help. Also, re-installing from scratch for all computers on our network is not trivial, so without seeing some sort of special step in there intended to work around the problem, it really just seems like you are saying "have you tried turning it off and on again"! I will.
There seem to be two updates http://support.microsoft.com/kb/2807986 and http://support.microsoft.com/kb/2670838 that were released on 12th March, and actually I have uninstalled both from a couple of test machines but the problem still exists after removal. In addition, there were similar updates for both server and client, but your article does not explain which one is causing the issue. I have tested removal on workstations, but perhaps I need to try on the print server, or on both?
We have this problem in our environment and it is affecting users of Color 550 printers on 2 floors of the building. Can you please post more specific information as to exactly which update is causing the problem, so that I can remove it ASAP.
We are seeing the following issue for the products identified below that have an EFI Fiery Controller or front end.
The EFI Fiery Printer Will Not Print or is Slow After the Most Recent Microsoft Windows OS Update Dated March 12, 2013.
Below are the families potentially affected by this situation.
Please select on your printer family to be linked to a solution.
If these solutions do not help please consider contacting your support centre for further assistance.